Uncle tom's cabin started out as a series of articles printed in the national era, a newspaper.

The national Era paper is the correct answer.

Explanation:

It was an abolitionist newspaper that ran from 1847 to 1860. It contained four pages and seven columns and was published weekly in Washington D.C. John Green leaf Whittier and Harrier Beecher Stowe were regular contributor to the newspaper. Harriet  Beecher Stowe's Uncle Tom's cabin was published as a series in The National Era Newspaper. The paper was started and edited by Dr. Gamaliel Bailey in 1847. It published fiery articles which used to cause uproar among the Northern sympathisers.

here are some major conflicts i found. maybe pick one and do more research on it. (cause i ain't writing 6 paragraphs)

in 1877, the nez perce war took place.

1881 - president james garfield was assassinated.

1882 - the chinese exclusion act was passed.

1883 - a decision in the civil rights cases legalized racial segregation in the united states.

1887 - the dawes act was passed.

1893 - the panic of 1893 took place. (what a creative name)

and there are probably other topics you can find if you just search up "united states timeline," or "conflicts in the 19th century for america."

then once you find a topic you like find out how it affected the people of america and what not. (sorry if this feels a bit short changed, history was and never will be one of my strong topics)