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neutrality
When WWI broke out the United States decided to remained neutral for two and half years, until April 1917.
It was signed into a bill on May 20, 1862 by Abraham Lincoln, and then ended once the Federal Land Policy and Management Act was enacted in 1976. Except for Alaska, which continued with this Act until 1986.
Salutary neglect
Germany was sinking cargo ships supplying the Allies (Britain, France) and temporarily halted its policy of unrestricted submarine warfare. The resumption of this policy, combined with other factors, led to the US declaration of war in 1917, some three years after the fighting began in 1914.
it prevented nonwhite South Africans
He was anticommunist so he wanted to stop it from spreading. He decided that under the 'Truman Doctrine' the US would help any nation that was in danger of falling to communism. This was his policy of containment, his foreign policy.
George F. Kennan, a career Foreign Service Officer, formulated the policy of “containment,” the basic United States strategy for fighting the cold war (1947–1989) with the Soviet Union.
Communist containment (more commonly called "Soviet Containment" during those days). Or containing communist aggression.
It prevented nonwhite South Africans from fully participating in politics.
the policy of aiding resistance efforts in communist countries in order to roll back Soviet influence in the world
The government policy of containment of communism. It was felt that if a country became communist that the nearby countries would follow. This was called "domino effect" and ruled American foreign policy for 60 years. To some extent it still does,but the players have changed .
In 1969 the Cold War was still going on. One reason the United States was in Vietnam was the foreign policy of the containment of communism from spreading into Southeast Asia. It will be another 20 years before the Berlin Wall will come down in 1989.
The Dawes Plan was an attempt following World War I for the Triple Entente to collect war reparations debt from Germany. When after five years the plan proved to be unsuccessful, the Young Plan was adopted in 1929 to replace it.
Isolationism
The use of mustard gas in the trenches of WWI did not contribute to emphasis on consumerism in American culture in the years following World War 2.
It was not formed in World War II, it was formed for years after in 1949