The german army invaded Greece, Netherlands<span>, </span>Belgium<span>, </span><span>, France, Denmark, </span>Yugoslavia, Luxembourg, Norway<span> and Western </span>Poland.
Its purpose was to generate revenue for the federal government (to run the government and to pay the interest on its debt), and also to act as a protective barrier around newly starting domestic industries. An import tax set by tariff rates was collected by treasury agents before goods could be unloaded at U.S. ports.
Developed by the administration of Harry Truman in the late 1940s, the correct answer is the policy of containment.
Containment refers to the US's policy, developed by legendary diplomat George Kennan, where the US would help any free nation threatened by communism by stopping the spread of communism.