<span>
Geography played a critical role in the economic development of ny, boston and charleston, since all of these cities were located on the atlantic ocean and had protected harbors, that allowed for unprecedented levels of trade with both other states and other nations.</span>
Answer:
The spread of communism
Explanation:
America fought in the Vietnam war because we wanted to stop the spread of communism before it started another word war. We tried to stop it, however it was a pointless war for us to be in. So we withdrew troops and left, allowing communism to spread. This was a huge loss for America.
<span>Since 1848, the Rio Grande has marked the boundary between Mexico and the United States. It affected domestic policy in that the river had been a cause for a discord between the US and Mexico and special policies were implemented for the area.</span>
