It is otherwise known as the underwater mountain

Sea mount.

Explanation:

Underwater mountain is also known as Sea mount. Mauna Kea is the tallest mountain that is present in underwater having the height of 10,200 meters (33,500 feet) when measured from the base. Underwater mountain is located where tectonic plates are spreading apart. when the lava came out, it spreads on the ocean floor and with the passage of time, it becomes taller and in the end mountain is formed.

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)