A.Irrigate
They need to make an irrigation system to water their crops
The people who engaged in the political revolution wanted war because they thought war would unify the country. The had a desire to spread ideas of the Revolution to all of Europe.
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Answer:
Explanation:
The leading causes of the great migration were racial segregation and very poor economic conditions. The people who escaped that had to look elsewhere for a better economic base and a more tolerant society than in the south where Jim Crow laws were upheld. It is hard to say which push factor was stronger in this case because the terror was combined with very poor living conditions and the whole situation of black folks in the south was very bad.
The answer is A, natural selection.