Russia signed a peace treaty with germany to end its involvement in world war 1, leading to:

a: russia giving up its claim to resource-rich lands in eastern europe.
b: france invading russia to take advantage of its military weakness.
c: russia gaining control over colonies including finland and poland
d: germany promising to protect russia from foreign invasions

A. Russia giving up its claim to resource-rich lands in eastern Europe.

is the answer

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)

a flatwork hope this