The right answers are:
B. Department of homeland security, which protects the nation against terrorist attacks with coordination of country defense corps. It offers citizenship and migration services.
F. Department of defense, is a department of the executive arm of the federal arm of the United States. Their duties are coordinate and supervise all the agencies in order to preserve the national security and the armed forces of the united states.
The large land was isolated from the rest of the world by deserts oceans and mountains which enabled them to develop independently from other civilizations
More Americans were now able to move to the suburbs.
Population growth after World War II was a cause of expansion of cities into suburbs. The prices of homes in suburbs were more affordable to middle class families, due to lower land prices and new building practices like tract housing. With the growth of the suburbs, improvement of roadways became a priority. The Federal-Aid Highway Act passed in 1956 advanced and enabled further growth of the suburbs surrounding city centers.