Which principle does the U. S. Supreme Court apply when it declares an act of Congress unconstitutional? separation of powers
checks and balances
advice and consent
executive privilege

The answer will B which means checks and balances

if a bill passes in the house of representatives, it goes through a similar process in the senate. before a bill becomes law, it must be approved by both chambers of the legislature. the bill must pass with the same wording in the house of representatives and the senate before it can go to the governor for approval.

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)