@Harper,
If that's what passes for academic history these days, it's a sad case--it sounds like ideological propaganda to me. There was no "Spain" then. Philip the Fair, an Austrian and son of the Holy Roman Emperor, was the son of Mary of Burgundy, and when his grandfather, Charles the Bold of Burgundy died, his mother Mary became the
de jure ruler of all the Burgundian holdings which included the Netherlands. Philip married Juana la loca (Mad Joanna), the Queen of Castile and heir presumptive of Aragon--the daughter of Ferdinand and Isabella. They produced a son, Carlos, who became King Carlos I of Castile and Aragon (roughly, what we call Spain). He also became (through generous bribery), the Holy Roman Emperor Charles V. He was the emperor who opposed Martin Luther and who fought the wars of the Reformation. In 1555, he abdicated in favor of his son Philip II, but the German electors were once bitten, twice shy, and they did not elect Philip as HRE. So "Spain" did not exist, much less conquer the Netherlands. There was no genocide and there were no "Belgi." There
Flamands and Waloons, and there were the Dutch. Shortly after Philip II came to the throne, they fought a war with the French, lost, and went to Paris for a big party for everyone who had been heroes in the war. One of them was William of Nassau, and as he rode out hunting with King Henri of France, Henri, assuming William was in the know, spoke to him of the massacre of Protestants which he (Henri) and Philip were planning. Willim kept his peace, saying nothing, but when he got back to the Netherlands, he spread the word among the Protestants there. The French thereafter called him Guillaume le taciturne--William the Silent. Although raised as a Catholic, William may have become a Protestant eventually, although no one really knows. He was to become the leader of the Dutch rebellion against the Spanish, and was assassinated by a mentally unstable Catholic boy in 1584.
The Dutch Rebellion is also known as the Eighty Years War, and they fought the Spanish off and on until 1648, when their independence was recognized in the Peace of Westphalia. There was no conquest, there was no genocide.
Really, it's an appalling thought that this sort of drivel might be being taught as history these days. But i guess that's easier than doing the difficult work of actually learning and understanding what truly happened.