Explain how the united states and the soviet union became rival powers after ww2.

the us was capitalist society and the Soviet union was communist creating a rift between the two after world war two because the us frightend that communism would spread

porter is writing economic history because he is focusing on the cost of developing vaccines.

roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.