The united states neutrality policy ended in march 1941 when this act was passed in
response to german attacks on u. s. ships in the atlantic.

This is the Lend-Lease Act of 1941. The law allowed the US government to lend or lease weapons and supplies to another countries. The legislation made it possible to provide military aid to Western allies fighting Nazi Germany, while the USA could still remain a neutral country formally. The Second World War had already started, France had fallen and Great Britain was fighting alone. After June 1941, even the Soviet Union benefitted from the effects of the Lend and Lease Act.

Explanation:

the soviet union wanted to impose communist governments in eastern europe.

you didn't list the options. however, a few communist countries today are: the people's republic of china, north korea, and cuba.