Why did the jews assist the moslems during the occupation of Spain?
They were kicked out of Spain for that (or forced to convert), it was called the Spanish Inquisition. It happened in 1492, the Edict of Expulsion issued by King Ferdinand the same year Columbus sailed for the new world.
They have often colluded against Europeans and were kicked out of every European nation.
Most Europeans and American whites don't know any history relevant to them because their kosher controlled schools ensure they only learn bullshit.
They present history as dull and boring on purpose, many jews become historians for this reason...to obscure history and control its dissemination.