Answer: The doctrine of containment was United States policy that used numerous strategies to prevent the spread of communism abroad.
The doctrine of containment was implemented in 1947 with Truman Doctrine. Truman Doctrine guaranteed immediate economic and military aid to Greece and Turkey.
Explanation:
The doctrine of containment came into figure by George F.Kennan. This doctrine came just after world war II. This was the time when United States and Soviet Union were involved in Cold War with each other.
One can consider this doctrine as a component of this Cold War.
During Cold War, Soviet Union was trying to enlarge it's communist influence Eastern Europe, China, Korea and Vietnam. In response to this step of Soviet Union, United States came out with a geopolitical strategic foreign policy know as the doctrine of containment.
This doctrine was implemented in 1947 with Truman Doctrine and in 1957 with Eisenhower Doctrine.
John Soule coined the phrase "go west with and grow with the country".
It was popularized by New York Tribune editor Horace Greeley.
Answer: D
Explanation: Im not too sure if thats right sorry if its wrong
People who leave their countries because the land had been settled.
<h3>What is a frontier?</h3>
A frontier is the area of Land that is shared by two countries.
It is the border or outskirt of the country which can be occupied by people form the various country. People move here in war time or to search for greener pastures.
Therefore, People moved to the frontier because the land had been settled.
Learn more on frontier here,
brainly.com/question/24693743
Second Sino-Japanese War, (1937–45), conflict that broke out when China began a full-scale resistance to the expansion of Japanese influence in its territory (which had begun in 1931).
