The disruption in Atlantic shipping prior to and during the War of 1812 increased the manufacturing and this was the way it affected the United States economy. Since there was problem in importing products, so to balance it, the internal production was increased and this way the economy sustained that period.
The answer is A, '' The destruction caused by the war led countries to isolate themselves from the world ". When WW2 broke out countries wanted to stay apart from other countries because They were afraid that the other country would join the war and bring destruction to their country.
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I believe the largest Western African empire is the Songhai empire.
WWII America watched everyone fight it out and when Germany was about to lose came in and stole the credit
The destruction of Europe again completely made Europe weaker than US.
Distrust of the Russians, US refused to help the USSR when they could have easily done so to build up trust.
So in the end the only superpowers remaining were the US and USSR and in any situations there can only be 1 leader of a world. Both competed to be the best which leads to the arm race and the cold war. But soon the US outcompeted them and became what it is today.
The world superpower that creates a mess all over the world to promote its own interests