America's rise to world-power status came in three stages:
1-As the newly emerged industrial giant in 1880-1910, American steel, grains, and crude oil output matched and exceeded that of Germany and England, enabling the United States to expand it's military. America's overwhelming and easy victory in the Spanish-American War forced the Europeans to consider the U.S. as equals.
2-The French and British armies had collapsed in WW1, and only American military might and industrial strength saved them from surrender in 1917. The world's post WW1 economy was dominated by the United States as the Europeans tried to rebuild their war-shattered economies and infrastructures.
3-WW2. Very simply, the United States industrial strength armed the world against the Germans and Japanese, and the subsequent Marshall Plan and it's equivalent in Japan cemented America's status as a superpower.
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The US emerged as a superpower when it helped win World War 2 and helped with World War 1. The nations of the globe recognized the US as being one of the richest and most powerful nations in the world at the end of World War 2 and at the end of the Cold War. They know we have military supremacy over other nations but now they know we do not have financial supremacy any longer.
The US became a Power after WWI because we did not have the massive economic damage that the European powers had. The ottomans were forced to disband, the Austria-Hungarian empire was forced to disband, The Kaiser of the German Empire was exiled, France was destroyed, Russia became the USSR, and Britain was still a world power, but they had taken loans from the US in the war, so they had to pay us lots of money. (they still haven't paid it off.) the other countries were not world powers at the time.
After World War II, the US and USSR became the two superpowers of the world since they had nuclear weapons and all the other nations were too poor and weak or devastated from WWII. When the USSR collapsed at the end of the Cold War, this left the US as the sole major power.
Because of all of there segregation
Isolationism is a policy of not being involved in world affairs. This means a country does not bother itself with worrying about the welfare of other countries.
The institution of slavery in the United States of America ended with the culmination of the United States Civil War, which ended in 1865.
The result of the Spanish/American War helped the United States become a world power by letting other countries know that the United States was not going to back down. Other countries did not want to start a conflict with the United States after this war.
Slavery in the United States lasted as a legal institution until the passage of the Thirteenth Amendment to the United States Constitution in 1865.