What has been the most important cause of productivity growth in the u. s. labor force, progress in medicine, progress in technology, progress in communication, progress in labor laws and regulations

b) race riots in several cities

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: