America changed in many ways over that time period. Slavery was becoming more prominent in the South after Eli Whitney introduced the cotton gin in 1794. If you can believe it, slavery was actually on the decline until that time! Slavery then increased ten fold. Uncle Tom's Cabin exploited slavery to millions and energized anti-slavery in the North while provoking anger in the South. The South seceded from the nation in 1861.
The civil war was probably the biggest change in America but it also became very industrialized as immigrants began to move to the US and as several inventions (involving steam) were made. This also helped expand the United States westwards.
It's nearly impossible for me to summarize America in such a large time period but I hope this gave you some ideas
People didn't like them
to improve working conditions
It started with the gold rushes and the buiding of the railways.
USA was never an imperial power.
John D. Rockefeller
Late 1800's
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People didn't like them
They came in the late 1800 and the early 1900
The largest change was no doubt the arrival of moving pictures.
American Red Cross
sometime during the slave trade, which was in the late 1800's
By passing the Platt Ammendment