[Menydh]

A few comments here and there.

Hostility toward Jews was particularly virulent during the Middle Ages, and reached its high point with the expulsion of the Jews in 1492.

Actually, the high point was reached one hundred years earlier, in 1391. The riots and progroms extended through virtually all the kingdoms of the Spains. One spark that lighted the fuel was an attack against the Primate Cathedral of Toledo by a mob of Jews. Followed by the reaction of the people.

The preachings of St. Vicent Ferrer in Valencia against the Jews were directed towards the spreading of the anti-Jewish feelings throughout the Peninsula. In Barcelona, el call (the Jewry) was attacked and most Jews in Catalonia crossed the Pyrenees.

In Seville, when the Holy Inquisition was established a century later to search for "false converses", they found little work to do since there had remained virtually none after the 1391 progroms.

1492 remains a significative year for it was made official through the Edict of Expulsion. However after the events of 1391 and many others in the following years until 1492, few Jews remained in Spain.
The remaining Jews..

Afterwards, it affected Jews who had converted to Christianity, and took on a racist content with the “purity of blood” statutes. Yet it was even then a prejudice with no relation to an actual Jewish community in Spain.

These [false] converts fled for protection first to Turkey and France and then to England and Then Netherlands. Some returned to their Hebrew faith, but many others remained "christian" and were actively involved in the formation and rise of Protestantism, especially the Neo-Judaic forms of Calvinism (Dutch Reformed, Puritans, Presbyterians, ..), which much later would further transform or influence the existing sects in the US.

Also notice that the rise of England and The Netherlands coincides with the time when these Jews (both in the form of converse and not) arrive in those two countries.

In the twentieth century, the Spanish version of the “conspiracy theory” was inherited from the nationalist Catholic tradition, based on the conception of an imaginary “internal enemy” plotting the downfall of the Catholic religion and the traditional social order.

It is no secret that Jews continued plotting against Spain from their new havens and with the connivance of those countries.

Alongside with the spread of Judaism from London and Amsterdam first, and later from America.

For the most part, political antisemitism has not been a central issue for the Spanish extreme Right, and it had only minor importance in Spanish fascism.

Wrong. In Spain anti-Judaism is/was a social issue under Christian ideology, unlike the biological anti-Semitism in Germany.

The difference being that many who would adhere to the biological concepts nowadays start to see Jews as "White" allies. Which makes sense.. to them.