How did the Romans increase the effectiveness of trade by sea?

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:

imma have to go   the third option

sorry if i am wrong hope this

if i am right plz give me brainliest