General
was the
first commander of US forces and later became
president

George Washington.

Explanation: He helped in a a battle when he was younger and people adored him so much, that he became the General during the revolutionary War. He also introduced concepts that Presidents still use today. He beat the British by cornering them and once, surprise attacking them.  Sadly, he died 2 years after his Presidency. Alexander Hamilton, Washington's most trusting advisor, helped Washington with important choices when he was President.

name two ways organisms join a population and two ways organisms leave a population. two ways organisms join a population are birth rate and immigration. two ways they leave are death rate and emigration.

explanation:

these civilizations were located around fertile rivers, where they could produce an abundance of crops