George washington had been a member of the second continental congress in 1775, but did not sign the declaration of independence in 1776. why didn't he sign the declaration?
a) he didn't agree with the declaration.
b) he had been elected governor of virginia.
c) he had an ongoing feud with thomas jefferson.
d) he was leading the continental army against the british

I believe its D) He was leading the Continental Army against the British

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)