interdependence is when all participating groups and individuals depend on each other. if you depend on one anothers goods, you end up trading in order to get the items you're looking for. (for ex: if i have food and you have water, we trade in order to depend on each other to live)
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)
need more info
what are the choices?