Can you help me with question 7? Also giving Brainiest.

The cattle business on the Great Plains became more profitable due to the development of growing populations in the eastern cities

Explanation:

each played a major role in ending the cold war.

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.