Brunelleschi solve his problem with the dome of the Florence Cathedral by employing sets of diagonal ribs based on the pointed arch and he also created many layers of support within the dome. The answer in this question is by employing sets of diagonal ribs based on the pointed arch.
NATO was designed to improve on the alliances of the past and to modernize the alliance system in light of the threat of nuclear power. The idea of collective security meant that war could trigger alliances linked on social, political and economic and ideological frameworks as well as a deterrent in terms of nuclear power.
Answer:
Correct answer is A. turned over documents proving that Soviets were trying to infiltrate the U.S. government.
Explanation:
Option A is correct because this event created a massive retaliation in the United States, where many people were marked as Communists, sometimes even without evidences.
Venona project was started during WW2 with a goal to decrypt messages that were sent by Soviet intelligence agencies.
McCarran Act was introduced in 1950, with a goal to act against Communism in US.
D is also not correct as many in Hollywood were marked as Communist and there were testimonies against them even on courts.
