Answer:
I will name three important events, but I do not know if they are the most important.
The American War of Independence set us up and got us going.
Considering the amount of resources and territory that were added to the United States, the War with Mexico was a very important event.
Ditto the Louisiana Purchase.
Considering what resulted, one very important event was the election of Abraham Lincoln as President.
Well, that is four.
Important because of their impact are Abraham Lincoln, Woodrow Wilson, Franklin Roosevelt.
Three that I am able to admire are George Washington, John C. Breckinridge, Robert E. Lee.
Explanation:
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