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no shots were fired. Then one day, the Russians opened the border again. Soon
afterward, a new German state appeared in the West, the Federal Republic of Ger-
many, based on the values of the Western Allies. Subsequently, the Russians
endorsed the German Democratic Republic in the East, based on sovietization.
Both sides built new alliance systems. The North Atlantic Treaty Organization
(NATO) bound together most Western European states with Canada and the United
States in a mutual defense pact. Sweden and Switzerland retained their neutrality.
Russia arranged the Warsaw Pact with its satellite states (Poland, East Germany,
Czechoslovakia, Hungary, Rumania, and Bulgaria) to better coordinate their mili-
tary forces in opposition to NATO. These military alliances, ready to fight World War
III, faced one another across the barbed wire and barricades that ran through the
heart of German field and forest. Still, the divisions solved the ‘‘German problem,’’
at least temporarily.
An arms race continued to threaten the world nevertheless. By 1949, the Rus-
sians had their own atomic bomb. Then, by 1952, the United States developed the
hydrogen or H-bomb, on which most modern thermonuclear weapons are based.
Each H-bomb can have the explosive power of hundreds of times the Hiroshima
and Nagasaki devices (each of which destroyed an entire city). Aided by information
gained through espionage, however, the Russians soon tested a nuclear weapon of
their own. With or without spying, nuclear proliferation remained inevitable. With
enough time, effort, money, and access to supplies, any nation can harness science
to build nuclear as well as biological, chemical, and any number of conventional
weapons. Throughout the Cold War, both sides kept shortsightedly relying on some
technological superiority or another, only to see it vanish with the next application
of scientific effort by the other side.
At first, complexity and cost usually meant that nuclear weapons remained in
the hands of great powers. The British were next with nuclear bombs in the 1960s,
quickly followed by the French. Then the Soviet ally China came next. By the 1990s,
India tested its prototype bomb, which prompted Pakistan to produce its own. It is
unclear when South Africa and Israel got theirs, probably sometime in the 1970s,
although South Africa has given up its technology. Currently, North Korea and Iran
are striving to join the ‘‘nuclear club.’’
These states, though, each held only a handful of nuclear weapons. The two
superpowers, however, held enough to destroy the world many times over. As tech-
nicians perfected ICBMs (intercontinental ballistic missiles) by the late 1950s, any
target on the globe was vulnerable to vaporization. By 1977, the superpowers had
stockpiled tens of thousands of nuclear devices—with the equivalent of about fif-
teen tons of TNT per person on the planet.
During the Cold War, the superpowers never pressed the button to end human
history with the explosion of nuclear weapons. Instead, they relied on deterrence
(preventing war through the fear that if one side starts nuclear war, the other will
finish it). The American policy of deterrence was aptly called MAD, the acronym for
‘‘mutually assured destruction.’’ Both sides did play at brinkmanship (threatening
to go to war in order to get your opponent to back down on some political point).
In reaction to this threat to civilization, some citizens of Western states began calling
for nuclear disarmament. Governments also realized that they could not endlessly
build risk into global politics. As a result, some areas became off limits for weapons
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