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Three nations divided into communist and non-communist were Germany, Korea and Vietnam(until it became completely communist)
North Vietnam & North Korea
became Communist and reunited with North Vietnam
China began the transition to state capitalism in 1949. There cannot be a Communist country, as Communism (a classless stateless society based on production for use) can only be introduced at a global level.
During the Viet War North Vietnam was a communist nation; the Republic of South Vietnam, which no longer exists, was a free democratic nation. After the war ended in 1975 both N & S Vietnam became one communist country (because North Vietnam won the war, they conquered the Republic of South Vietnam).
Vietnam became one communist country.
It became a communist but united country,
Both the Korean and the Vietnam Wars were fought because of the Domino Theory. It was thought that if one country became communist, nearby nations would fall under that ideology too.
After the first Indochina war, Vietnam was divided into two nations, North Vietnam (Communist) and South Vietnam (anti-Communist), based on the Geneva Accord. After South Vietnam's army fell at the end of the Vietnam War, the two countries became one.Note: Korea was also divided into two nations following World War 2, but the division was based on plans developed by the United Nations which partitioned the country along the 38th parallel, with the Soviet Union adminstering the northern part and the United States administering the southern part. The politics of the Cold War resulted in the 1948 establishment of two separate governments, North Korea and South Korea.
During the Vietnam War, North Vietnam was communist, and South Vietnam wasn't. Following the war, the unified country is now communist (and is one of the very few remaining communist nations).
The U.S. became involved in Vietnam to contain the spread of communism during the Cold War. It viewed Vietnam as a strategic location in Southeast Asia and sought to prevent the domino effect of one country falling to communism leading to others doing the same. Additionally, the U.S. had a commitment to support South Vietnam in its fight against the communist North Vietnamese forces.
The Americans had a thing called the domino theory, that was if Vietnam became a communist country that all surrounding countries would as well. The Americans were really scared of Communism so they went to Vietnam to stop it.