Why did africa become the site of so many proxy wars during the post-war era?

the group i'm selecting: greeks.

a first group of greek immigrants came to the us in the 1850s. the second group came to america starting in the 1890s due to economic opportunities they didn't have back in their home caused by the hardships of ottoman rule. greek immigration was 90% male, many of them expected to work and return to greece after earning enough capital, but ultimately had to remain in the us after the greek genocide.

the answer should be a. the sui empire, the tang empire extended from korea in the west to manchuria in the east.

the answer to your question is c