The primary purpose was to eliminate the influence of practicing Jews on Spain's large formerly-Jewish converso New Christian population, to ensure the latter and their descendants did not revert to Judaism.
Over half of Spain's Jews had converted as a result of the religious persecution and pogroms which occurred in 1391. Due to continuing attacks, around 50,000 more had converted by 1415. A further number of those remaining chose to convert to avoid expulsion.
As a result of the Alhambra decree and persecution in the years leading up to the expulsion, of Spain’s estimated 300,000 Jewish origin population, a total of over 200,000 had converted to Catholicism to remain in Spain, and between 40,000 and 100,000 remained Jewish and suffered expulsion.
An unknown number of the expelled eventually succumbed to the pressures of life in exile away from formerly-Jewish relatives and networks back in Spain, and so converted to Catholicism to be allowed to return in the years following expulsion.
The edict was formally and symbolically revoked on 16 December 1968, following the Second Vatican Council.
This was a full century after Jews had been openly practicing their religion in Spain and synagogues were once more legal places of worship under Spain's Laws of Religious Freedom.
In 1924, the regime of Primo de Rivera granted Spanish citizenship to the entire Sephardic Jewish diaspora. In 2014, the government of Spain passed a law allowing dual citizenship to Jewish descendants who apply, to compensate for shameful events in the country's past. Thus, Sephardi Jews who can prove they are the descendants of those Jews expelled from Spain because of the Alhambra Decree can become Spaniards without leaving home or giving up their present nationality.
More information: The Atlantic
By the end of the 8th century, Muslim forces had conquered and settled most of the Iberian Peninsula. Under Islamic law, the Jews, who had lived in the region since at least Roman times, were considered People of the Book, which was a protected status.
Compared to the repressive policies of the Visigothic Kingdom, who, starting in the sixth-century had enacted a series of anti-Jewish statutes which culminated in their forced conversion and enslavement, the tolerance of the Muslim Moorish rulers of al-Andalus allowed Jewish communities to thrive.
Jewish merchants were able to trade freely across the Islamic world, which allowed them to flourish, and made Jewish enclaves in Muslim Iberian cities great centers of learning and commerce.
This led to a flowering of Jewish culture, as Jewish scholars were able to gain favor in Muslim courts as skilled physicians, diplomats, translators, and poets. Although Jews never enjoyed equal status to Muslims, in some Taifas, such as Granada, Jewish men were appointed to very high offices, including Grand Vizier.
The Reconquista, or the gradual reconquest of Muslim Iberia by the Christian kingdoms in the North, was driven by a powerful religious motivation: to reclaim Iberia for Christendom following the Umayyad conquest of Hispania centuries before. By the 14th century, most of the Iberian Peninsula had been reconquered by the Christian kingdoms of Castile, Aragon, León, Galicia, Navarre, and Portugal.
More information: eSefarad
During the Christian re-conquest, the Muslim kingdoms in Spain became less welcoming to the dhimmi. In the late twelfth century, the Muslims in al-Andalus invited the fanatical Almohad dynasty from North Africa to push the Christians back to the North. After they gained control of the Iberian Peninsula, the Almohads offered the Sephardim a choice between expulsion, conversion, and death.
Many Jewish people fled to other parts of the Muslim world, and also to the Christian kingdoms, which initially welcomed them. In Christian Spain, Jews functioned as courtiers, government officials, merchants, and moneylenders. Therefore, the Jewish community was both useful to the ruling classes and to an extent protected by them.
As the Reconquista drew to a close, overt hostility against Jews in Christian Spain became more pronounced, finding expression in brutal episodes of violence and oppression.
In the early fourteenth century, the Christian kings vied to prove their piety by allowing the clergy to subject the Jewish population to forced sermons and disputations. More deadly attacks came later in the century from mobs of angry Catholics, led by popular preachers, who would storm into the Jewish quarter, destroy synagogues, and break into houses, forcing the inhabitants to choose between conversion and death.
More information: Kyra Cornelius Kramer
Thousands of Jews sought to escape these attacks by converting to Christianity. These Jewish converts were commonly called conversos, New Christians, or marranos; the latter two terms were used as insults. At first, these conversions seemed an effective solution to the cultural conflict: many converso families met with social and commercial success. But eventually their success made these new Catholics unpopular with their neighbours, including some of the clergy of the Church and Spanish aristocrats competing with them for influence over the royal families.
By the mid-fifteenth century, the demands of the Old Christians, that the Catholic Church and the monarchy differentiate them from the conversos, led to the first limpieza de sangre laws, which restricted opportunities for converts.
These suspicions on the part of Christians were only heightened by the fact that some of the coerced conversions were undoubtedly insincere. Some, but not all, conversos had understandably chosen to salvage their social and commercial positions or their lives by the only option open to them -baptism and embrace of Christianity- while privately adhering to their Jewish practice and faith.
Recently converted families who continued to intermarry were especially viewed with suspicion. These secret practitioners are commonly referred to as crypto-Jews or marranos.
The existence of crypto-Jews was a provocation for secular and ecclesiastical leaders who were already hostile toward Spain's Jewry.
For their part, the Jewish community viewed conversos with compassion, because Jewish law held that conversion under threat of violence was not necessarily legitimate.
Although the Catholic Church was also officially opposed to forced conversion, under ecclesiastical law all baptisms were lawful, and once baptized, converts were not allowed to rejoin their former religion. The uncertainty over the sincerity of Jewish converts added fuel to the fire of antisemitism in 15th century Spain.
The Spanish expulsion was succeeded by at least five expulsions from other European countries, but the expulsion of the Jews from Spain was both the largest of its kind and, officially, the longest lasting in western European history.
Hostility towards the Jews in Spain was brought to a climax during the reign of the Catholic Monarchs, Ferdinand and Isabella. Their marriage in 1469, which formed a personal union of the crowns of Aragon and Castile, with coordinated policies between their distinct kingdoms, eventually led to the final unification of Spain.
Although their initial policies towards the Jews were protective, Ferdinand and Isabella were disturbed by reports claiming that most Jewish converts to Christianity were insincere in their conversion.
As mentioned above, some claims that conversos continued to practice Judaism in secret were true, but the Old Christians exaggerated the scale of the phenomenon. It was also claimed that Jews were trying to draw conversos back into the Jewish fold.
More information: Los Angeles Times
In 1478, Ferdinand and Isabella made a formal application to Rome to set up an Inquisition in Castile to investigate these and other suspicions.
In 1487, King Ferdinand promoted the establishment of the Spanish Inquisition Tribunals in Castile. In the Crown of Aragon, it had been first instituted in the 13th century to combat the Albigensian heresy. However, the focus of this new Inquisition was to find and punish conversos who were practicing Judaism in secret.
These issues came to a head during Ferdinand and Isabella's final conquest of Granada. The independent Islamic Emirate of Granada had been a tributary state to Castile since 1238.
Jews and conversos played an important role during this campaign because they had the ability to raise money and acquire weapons through their extensive trade networks.
This perceived increase in Jewish influence further infuriated the Old Christians and the hostile elements of the clergy.
Finally, in 1491 in preparation for an imminent transition to Castilian territory, the Treaty of Granada was signed by Emir Muhammad XII and the Queen of Castile, protecting the religious freedom of the Muslims there.
More information: The Times of Israel
By 1492, Ferdinand and Isabella had won the Battle of Granada and completed the Catholic Reconquista of the Iberian Peninsula from Islamic forces. However, the Jewish population emerged from the campaign more hated by the populace and less useful to the monarchs.
The king and queen issued the Alhambra Decree less than three months after the surrender of Granada. Although Isabella was the force behind the decision, her husband Fernando did not oppose it. That her confessor had just changed from the tolerant Hernando de Talavera to the very intolerant Francisco Jiménez de Cisneros suggests an increase in royal hostility towards the Jews.
The text of the decree accused the Jews of trying to subvert the holy Catholic faith by attempting to draw faithful Christians away from their beliefs.
In practice, however, the Jews had to sell anything they could not carry: their land, their houses, and their libraries, and converting their wealth to a more portable form proved difficult.
The market in Spain was saturated with these goods, which meant the prices were artificially lowered for the months before the deadline.
As a result, much of the wealth of the Jewish community remained in Spain. The punishment for any Jew who did not convert or leave by the deadline was summary execution.
The Sephardic Jews migrated to four major areas: North Africa, the Ottoman Empire, Portugal, and Italy. Some who emigrated to avoid conversion dispersed throughout the region of North Africa known as the Maghreb.
A majority of Jewish population had converted to Christianity during the waves of religious persecutions prior to the Decree -a total of 200,000 converts according to Joseph Pérez.
More information: University of Washington
The main objective of the expulsion of practicing Jews was ensuring the sincerity of the conversions of such a large convert population. Of the 100,000 Jews that remained true to their faith by 1492, an additional number chose to convert and join the converso community rather than face expulsion.
Recent conversos were subject to additional suspicion by the Inquisition, which had been established to persecute religious heretics, but in Spain and Portugal was focused on finding crypto-Jews. Although Judaism was not considered a heresy, professing Christianity while engaging in Jewish practices was heretical.
Additionally, Limpieza de sangre statutes instituted legal discrimination against converso descendants, barring them from certain positions and forbidding them from emigrating to the Americas. For years, families with urban origins who had extensive trade connections, and people who were learned and multilingual were suspected of having Jewish ancestry.
According to the prejudice of the time, a person with Jewish blood was untrustworthy and inferior. Such measures slowly faded away as converso identity was forgotten and this community merged into Spain's dominant Catholic culture. This process lasted until the eighteenth century, with a few exceptions, most notably the Chuetas of the island of Majorca, where discrimination lasted into early 20th Century.
A Y chromosome DNA test conducted by the University of Leicester and the Pompeu Fabra University has indicated an average of nearly 20% for Spaniards having some direct patrilineal descent from populations from the Near East which colonized the region either in historical times, such as Jews and Phoenicians, or during earlier prehistoric Neolithic migrations.
Between the 90,000 Jews who converted under the Visigoth persecutions, and the 100,000+ Jews who converted in the years leading up to expulsion, it is likely that many of these people have Jewish ancestry. Genetic studies have explored local beliefs in the American South West that Spanish Americans are the descendants of conversos.
More information: NCBI
Violence that begins with the Jews never ends with them.
All of this is true.
What's also true is that anti-Semitism is the oldest hatred
in the world because individual people have sustained
It cannot be defeated until we look these people