None - Barack Obama was the first black president.
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The way Reagan put pressure on the Soviet Union is by engaging in a military buildup the Soviets couldn't hope to equal.
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The Three Mile Island accident was a meltdown at a nuclear power plant near Middletown, Pennsylvania. It occurred on March 28, 1979. Officially, it caused no deaths. But unofficial investigations and lawsuits claimed there were above-average rates of cancer and birth defects in the surrounding area.
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Because it can be amended.
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The United States Constitution is said to be a living document because is malleable.
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The brinkmanship of the Nuclear Arms Race lead to the advancements in the Space Race. Each of the superpowers continued trying to outdo each other in their weapon technology and this competition continued into the Space Race and creating space exploration technology.
