The "iron curtain" winston churchill referred to the "iron curtain" winston churchill referred to a) was one of the primary causes of world war ii. b) was caused by the collapse of the soviet union. c) divided korea into two separate countries along the 38th parallel. d) divided european countries into two groups- communist and non-communist.

during the 20th century, the role of the vice president has evolved into more of an executive branch position. now, the vice president is usually seen as an integral part of a president's administration and presides over the senate only on ceremonial occasions or when a tie-breaking vote may be needed.

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.