1) How had the size of the United States changed?
It has now expanded to the West coast.
2) How had the population make-up of the United States changed?
<span> The population of U.S increased to 38.5 million in 1870.
3) What new innovations changed life in the United States?
</span> There are innovations in transportation, communication, and traveling.
4) What key events changed the United States?
Some key events include the Indian Wars, the Texas Revolution, The Spanish-American War, Louisiana Purchase, the purchase of Alaska, the Mexican Cession, the War of 1812.
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5) How was citizenship defined during each time period? How was enfranchisement (the right to vote) defined?
The right to vote was extended to all men citizens. </span>
They did not want the US to take the side of the british.
It brought people together for friendly competition and as a distraction it provided a new means of entertainment that all could enjoy
I think it was the Three-Fifths compromise
East across North Pacific Ocean, South-East under Mexico, North in between Mexico and Cuba, and East into Florida.