How are the leaders of the two parties in congress chosen?

How are the leaders of the two parties in Congress chosen?

Members vote at a party caucus before Congress organizes.

MAYBE

for the united states of america, 1945 to 1964 was a time of high economic growth and general prosperity. it was also a time of confrontation as the capitalist united states and its allies politically opposed the soviet union and other communist countries; the cold war had begun.

explanation:

they both built pyramids.