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
The correct option would be D.
The fist shots in what? a war? if so which and if not then what shots are you reffering to??
Answer:
Pioneers faced many challenges on farming the Great Plains. In particular, they had to find solutions to farming problems such as ploughing the land, growing crops, lack of water, protecting the crops, fire, insects, farming machinery, and extreme weather.
The right answer for the question that is being asked and shown above is that: "D. All of them were affected by the Columbian Exchange." Among the choices, there is no <span>affected by the Columbian Exchange</span>