The Cold War Unfolds

Chapter 15Section 1

Superpowers After WWII, the USA and the USSR emerged as

superpowers – nations stronger than other powerful nations

Each created a military alliance made up of nations they protected or occupied

The USA helped form the North Atlantic Treaty Organization (NATO), comprised of W. European allies

versus

Warsaw PactIron Curtain

USSR signed the Warsaw Pact with E. European countries

The imaginary line between the democratic west and the communist East was called the Iron Curtain

The Soviet Union crushed any revolts that challenged its supremacy in Eastern Europe

Iron Curtain

Arms Race Superpowers engaged in weapons race Both sides developed nuclear weapons To reduce the threat of war, the two sides held

disarmament talks One agreement was intended to limit the use

of anti-ballistic missiles (ABMs) ABMs were used to shoot down missiles

launched by hostile nations

Anti-Ballistic Missile

Nuclear Missiles

Trident Nuclear Missile Launch

The MIRVed U.S. Peacekeeper missile, with the re-entry vehicles highlighted in red

Minuteman III MIRV launch sequence:1. The missile launches out of its silo by firing its first stage boost motor (A).2. About 60 seconds after launch, the 1st stage drops off and the second stage motor (B) ignites. The missile shroud is ejected.3. About 120 seconds after launch, the third stage motor (C) ignites and separates from the 2nd stage.4. About 180 seconds after launch, third stage thrust terminates and the Post-Boost Vehicle (D) separates from the rocket.5. The Post-Boost Vehicle maneuvers itself and prepares for re-entry vehicle (RV) deployment.6. The RVs, as well as decoys and chaff, are deployed during backaway.7. The RVs and chaff re-enter the atmosphere at high speeds and are armed in flight.

8. The nuclear warheads detonate, either as air bursts or ground bursts.

A multiple independently targetable reentry vehicle (MIRV) is a collection of nuclear weapons carried on a single intercontinental ballistic missile (ICBM) or a submarine-launched ballistic missile (SLBM). Using a MIRV warhead, a single launched missile can strike several targets, or fewer targets redundantly. By contrast a unitary warhead is a single warhead on a single missile.

Anti-Ballistic Missiles ABMs were considered a threat because they

could give one side more protection, which might encourage it to attack

During the 1980s, President Ronald Reagan proposed a missile defense program called “Star Wars”

Other agreements limited the number of nuclear weapons that nations could maintain, which eased Cold War tensions

Anti-Ballistic Missiles The easing of tensions was called the era of

détente Détente is a relaxing of Cold War tensions

during the 1970s Both superpowers were talking more with less

direct hostile threats Détente ended, however, when the USSR

invaded Afghanistan in 1979

An artist's rendering of an X-ray laser hit an incoming missile

President Ronald Reagan

Cuba and Fidel Castro During the 1950s, Fidel Castro led a revolution

in Cuba and became the Cuban leader To bring down Cuba’s communist regime, U.S.

President John F. Kennedy supported a CIA-backed invasion of Cuba (Bay of Pigs)(1961), but the invasion failed

One year later, the Soviets shipped nuclear missiles to Cuba causing fear of a nuclear war

Video – Cuban Missile Crisis Watch this video! http://www.youtube.com/watch?v=Xo8SMzM8

X-U

Proximity of Cuba to the United States—90 miles

Fidel Castro – Dictator of Cuba

Bay of Pigs(Bahía de Cochinos)

President John F. Kennedy

Photos of Cuban Missile Sites Taken from U-2 Spyplane

Cuba and Fidel Castro The world was on the brink of a nuclear war for

thirteen days The U.S. navy blockaded Cuba with warships Finally, Soviet leader Nikita Khrushchev

agreed to remove the missiles The USA agreed to remove Jupiter nuclear

missiles from Turkey

Nikita Khrushchev

Jupiter Missiles in Turkey

Spreading Communism USSR wanted to spread communist ideology

around the world When Khrushchev came to power, he eased

censorship and increase tolerance However, repression returned under Leonid

Brezhnev, the next Soviet leader American leaders pursued a policy of

containment This was a strategy of keeping communism

from spreading to other nations (to “contain” it)

Leonid Brezhnev

Red Scare A “Red Scare” in the USA resulted in Senator

Joseph McCarthy leading an internal hunt for communists in the government and military

The House (of Representatives) Un-American Activities Committee (HUAC) also sought out communist sympathizers

People suspected of being communists were called to testify before a congressional committee as to their alleged activities in government, society, business, etc.

Powerpoint Questions (13 points)

1. What were the United States and the Soviet Union called?2 The two opposing military alliances were called ??? and ??? (2 points)3. An imaginary line that divided Europe between democratic and communist countries was called the ???4. What are ABMs? Describe.5. What defense system did President Ronald Reagan propose in the 1980s?6. A relaxation of tensions is called ???

Powerpoint Questions (13 points)

7. What did the USSR do that nearly triggered a nuclear war in 1962?8. Who was the leader of the Soviet Union during the Cuban Missile Crisis?9. What tactic did the USA employ to respond to the crisis?

Powerpoint Questions (13 points)

10. According to the video in this Powerpoint (slide #18), what secret agreement did Kennedy and Krushchev make regarding American missiles?11. Who became the next leader of the USSR?12. What was the “Red Scare”?

The End