The federal government supported the land offer
made in this advertisement by
(1) encouraging exploration for gold and silver
(2) creating a sharecropping system after the
civil war
(3) protecting the hunting grounds of native
american indians
(4) giving public land to railroad companies to
finance railroad construction

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:

north atlantic treaty organization.