Question

Can anybody help me?

Answer 1

Only if you ask a question. It's hard to help when we don't know what you need.

Answer 2

How did the communist takeover of North Korea impact U.S. foreign policy?
@wwhitlock

Answer 3

Korea was part of the Japanese empire until the end of WWII. As agreed during the war, the peninsula was occupied by the Soviets and the US at the 38th parallel, much the same as Germany was occupied by the allies.
A democratic, Western leaning government developed in the South and a communist Soviet leaning government developed in the North. This too was much like developments in Germany.
The US pulled out in 1948, the Soviets later that year. Joseph Stalin still controlled the North Korean government. The government in the south proved to be weak. The North Koreans wanted to invade but Stalin didn't approve until the Chinese offered to back North Korea.
In 1950, North Korea pretty much swallowed up the peninsula, The UN approved a police action. The US and some other countries landed and pretty much took control of the whole peninsula.
China entered the war and sent troops. By 1953 peace was negotiated and a Demilitarized Zone was setup along a line of demarcation. So the border between North and South was about the same as it was in 1950 when the war started.

The US responded to the Communist attempt to take control of the south as part of Truman's policy of containment. The US opposed the expansions of Communism world wide. Usually this was achieved by financial and equipment support from the US
Korea was the first proxy war of the Cold War. American troops were involved but the Soviets avoided direct confrontation. Proxy wars continued to be a feature of the Cold War. The USSR and USA fought in various locations, but their armies never faced each other directly and nuclear weapons were not used. But millions of local Koreans, Vietnamese, Angolans, Hondurans, Cubans, Afghanis etc... died as these proxy wars between the two superpowers continued.
I'm not sure you can point to Korea as a change in US Foreign Policy but perhaps the first instance of the developing Cold War policy.