It was the fact that world super powers at the time (U.S) and (U.S.S.R) where building up an armory of nukes but they both knew if they where to use these weapons it would utterly destroy the world.
Here's a memory aid: (U.S): hey Russia lets not kill each other with nukes in this war lets just keep it "COOL" and spy on each other instead
<span>The Creation of the National Aeronautics and Space administration in 1958 was a direct result of: the Sputnik crisis. </span>
After Saladin captured Aleppo he completed the conquest of Muslim Syria but he failed to take over the Zengid stronghold of Mosul.
Some benefits the Crusaders had even though they were not successful were that they increased the authority of the king and kings passed taxes to pay for the crusades.
The way the economic system changed in Europe is the the population began rising, technology began changing, more farming improvements, and trade began improving.
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A) The establishment of the National Park System