18 4 Two Nations Live on the Edge Brinkmanship Rules U.S. Policy How does the hydrogen bomb differ from the atomic bomb? What was the policy of brinkmanship? The Cold War Spreads Around the World What covert actions did the U.S. undertake in the Middle East and Latin America? What was the Warsaw Pact? What happened at the Geneva Summit? How did conflict over the Suez Canal start a was in the Middle East? What was the Eisenhower Doctrine? What happened during the Hungarian uprising? The Cold War Takes to the Skies How did the Soviet Union launch of Sputnik affect the U.S.? How did the U-2 flight of Francis Gary Powers influence U.S.-Soviet Union relations? Terms and Names Dwight D. Eisenhower Central Intelligence Agency (CIA) Nikita Khrushchev U-2 Incident