How did the Crusades contribute to the fall of the Byzantine empire?

The Crusades drove the Seljuk Turks out of the area, but it also opened up Byzantium to Latin aggression. Also, the Fourth Crusade (made up of Latin Crusaders) sacked Byzantium and greatly reduced power in the empire.

Explanation:

explanation:

there are two statements that are incorrect.

1. the marshall plan was a lend lease program. it was an economic plan that europe redevelop itself after wwii.

2. einstein didn't really do anything to further the allied cause in building the bomb. he merely sent a letter to fdr telling him (in 1939) that if the united states entered the war, perhaps it would be wise to build the bomb before germany did. i would say this answer is incorrect, but when america entered the war 2 years later, fdr thought it might be a good idea to take einstein's advice.

the 4th choice is definitely so wrong that is likely the single answer of this question