The answer is A I was reading a book about this and it had the same question and the answer was A
Northern portion of the Louisiana purchase and the Oregon territory
The answer is : The crusades.
The Crusades were a series of religious wars between Christians and Muslims started primarily to secure control of holy sites considered sacred by both groups. In all, eight major Crusade expeditions — varying in size, strength and degree of success — occurred between 1096 and 1291.