During the period of the crusades, warfare between christians an muslims lasted nearly years.

200 years

Explanation:

The “Medieval Crusades” were Western Christian expeditions to liberate from the Muslim domain the S. Sepulcher of Christ in Jerusalem, which was being destroyed by the Ottoman, Muslim Turks. They began in 1095 and end in 1291, when the Turks returned to the Holy Land. The crusades were marked by frequent quarrels between Christians and Muslims. As you can see from the length of the above, the war between Christians and Muslims lasted almost 200 years.

here are some events that to cause increased conflict between the north and south

1) mexican cession- gaining modern day california, utah, arizona, and new mexico from mexico. caused southern and northern politicians to fight over whether or not there would be slavery in these newly acquired territories.

2) uncle tom's cabin- this famous book described the cruelty of slavery in the south during the antebellum period, causing more northerners to support abolition and southerners to resent the book as they felt it unfairly depicted southern society.

3) kansas- nebraska act- disagreements over whether or not kansas and nebraska would be free or slave states caused issues between northern and southern politicians in congress.

4) bleeding kansas- this fighting took place in kansas after congress allowed this territory to vote on whether or not they would have slavery. citizens were killed and buildings were destroyed during this fighting.

answer: b.

explanation: