Which of these changes took place in the first two decades of the 20th century?
a. the united states went from being a net exporter to being a net importer.
b. the industrial workforce went from minority unionized to majority unionized.
c. the majority of the u. s. population lived in urban areas instead of rural areas.
d. the u. s. government moved from running a budget surplus to running a budget deficit.

The correct answer is C. In the first two decades of the 20th century the rural population of the United States started to move into the cities, as the increasing industrialization generated more and better jobs in the industrial sector rather than the rural ones.

During that period there have been events such as the Great Migration, which involved African-Americans moving from the rural Southern states to the industrial cities in the north of the United States.

your answer is

relations between the soviet union and the united states were driven by a complex interplay of ideological, political, and economic factors, which led to shifts between cautious cooperation and often bitter superpower rivalry over the years. the distinct differences in the political systems of the two countries often prevented them from reaching a mutual understanding on key policy issues and even, as in the case of the cuban missile crisis, brought them to the brink of war.

the united states government was initially hostile to the soviet leaders for taking russia out of world war i and was opposed to a state ideologically based on communism. although the united states embarked on a famine relief program in the soviet union in the early 1920s and american businessmen established commercial ties there during the period of the new economic policy (1921–29), the two countries did not establish diplomatic relations until 1933. by that time, the totalitarian nature of joseph stalin's regime presented an insurmountable obstacle to friendly relations with the west. although world war ii brought the two countries into alliance, based on the common aim of defeating nazi germany, the soviet union's aggressive, antidemocratic policy toward eastern europe had created tensions even before the war ended.

studies show tha in 7.5 billion years from now, the expanding sun will engulf, and destroy, the earth.