Why did the United States believe the Marshall Plan was necessary?
A. The United States believed it would prevent the Soviet Union from rebuilding its
military.
B. The United States believed it would help contain the spread of fascism
C. The United States believed it would prevent Germany from rebuilding its
military
D. The United States believed it would help contain the spread of communism,

Explanation:

In 1947, President Harry S. Truman pledged that the United States would help any nation resist communism in order to prevent its spread. His policy of containment is known as the Truman Doctrine.

The Truman Doctrine demonstrated that the United States would not return to isolationism after World War II, but rather take an active role in world affairs.

To help rebuild after the war, the United States pledged $13 billion of aid to Europe in the Marshall Plan.

D

Explanation:

After the Marshall Plan “no European nation felt communism”

an effect of the steamboat's popularity was that people began building canals in the united states and europe. this was done to find another way to transport goods across the country and in that time, transportation using the river was very slow and dangerous. it depended entirely on manpower and the current of the river. that all changed in the late 1700's when steamboats were introduced. they soon revolutionized travel and trade through the river and dominated the waterways. eventually, other means of transportation took over from the steamboats, but there was a time that they the united states to expand to the west.

i believe the answer would be 1.