What did people in the first civilizations do in order to grow crops?

The first civilizations developed in river valleys, where fertile land made it easy to grow crops and feed large numbers of people. The rivers provided fish and water. They also encouraged trade, which allowed the exchange of both goods and ideas. The cities that developed in these valleys became the centers of civilizations.

increased food supply

improved public health

increased birth rates

hope this : d

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 : )