The Reconquista. Jews and Muslims alike were driven out of Spain. The Reconquista ended in 1492 when Moorish Granada surrendered. The Muslims were allowed to remain in Spain. The Jews and the Muslims were expelled later.
This is a hard question to answer. Spain had Christians, Muslims, and Jews during the Middle Ages, but Christians and Muslims were in greater numbers than Jews. It is hard to know whether Muslims outnumbered Christians at some times, particularly around the year 800 or so. Earlier in the Middle Ages and later, in the Late Middle Age, Christians were in greater numbers.
It is an extremely unfortunate and pathetic chapter of Islamic History. The Muslims in Spain were put to sword, forced to convert to Christianity or forced to flee from Spain. Within a short period Spain was cleared of the Muslims where the Jews and the Christians had been living in peace for many centuries under the Muslim rule.
Muslims, Christians (who were all Catholics at this point) and Jews, in order of population numbers.
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Since the Muslims believe that Jews and Christians were "People of the book", they received special treatment.
Jerusalem is considered holy by Muslims, Jews, and Christians.
They had the power to persecute Jews and Christians if they had wanted to
Jews, Christians and Muslims were in the Crusades.
Jews, Christians and Muslims were in the Crusades.
Muslims believe that Jews and Christians corrupted the Scriptures given to them with the purpose of strengthening their power.
Muslims do not encourage their children not to like Christians. Christians and Jews are people of the book as mentioned in the Quran and the people closer to Muslims are Christians as mentioned in the Quran. Muslims are allowed to marry Christians and Jews as they are people of the book. It is therefore a misconception on your part to think that Muslims are encouraged not to like Christians!