How did control of the Bosporus contribute to the wealth of the Byzantine Empire?

What made the Byzantine Empire rich and successful for so long, and why did it finally crumble? Constantinople sat in the middle of a trade route,sea and land. Its wealth came from trade and its strong military. Constantinople remained secure and prosperous while cities in western Roman empire crumbles.

Explanation:

i think the answer is: cuba wanted to be independent from spain, and the u.s. wanted to end spanish rule in the west.

hope i

-lavira : )

"the attempts of the proletariat to rise above this abasement"