A concurrent power is a power that both the state and the federal governments share. The choice that is not a concurrent power is the power to sign treaties, because state governments cannot do so.
Answer:
By the Cold War.
Explanation:
After WWII, America and the Soviet Union knew they were BOTH international superpowers based on their success in defeating the Axis powers with nuclear weapons. Knowing this, the Soviets began expanding what I believe was south/east, and America felt threatened (somehow) to this process. So the non-violent "war" known as the Cold War (because the Soviet Union was cold and so is the USA) began.
I recommend the channel "Oversimplified" for further explanation.
(Before you ask, I do not sponsor "Oversimplified" or any channel for that matter.)
True, if the telegraph had existed before the war would have had a different outcome
Learn to cope with them as best as you can.
