Christianity
The Bulgarians and the Arabs were the 2 main enemies of the byzantine empire.
The fall of Constantinople in 1453 was important in many ways. One of the most significant was the subsequent emigration of Byzantine scholars and intellectuals (along with some of their treasured texts) to the West: their influence had a direct impact on the Renaissance and Reformation and, thus, on the subsequent course of Western History as a whole.
Their biggest achievement was the preservation of European culture.
Probably the biggest problem is injury
One of the biggest problems faced by Washington and his troops were the lack of food and clothing.
Confused
Heat... war, the usual.
Lack of freedom.
How are you? why do you have problems with my answers? :(
one of his biggest problems was how and what to do about slavery. when the civil war came to hand, he had no idea what to do, yet somehow managed it
Getting rid of his wealth.