Why do you think the circuits vary in the size of the geographical area
they cover?

no statements but ok.

the statement that best describes the idea of manifest destiny that was used in the 19th century would be that "it was fate that the united states would continue to  expand westward," since people thought the us was "destined" to do so. 

payments were made after the 1940s.

in the 1980s, a commission held investigations and made recommendations.

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