In 1492, via the Alhambra Decree, the Catholic Monarchs of Spain ordered the expulsion of a disputed number of Jews from the Crowns of Castile and Aragon, ranging from 45,000 to 200,000, and thus put an end to the largest communities in Europe. The expulsion of the Jews from Navarre followed suit in 1498.
And Spain fell from being a world power to being a 3rd-rate country, never to recover. Spanish racists ruined their own country, banishing the intelligent and productive members of their society.