Constantinople briefly served as the capital but was quickly conquered by the Persians.
The compromise of 1850 led to the civil war.
The Indian removal act was to allow President Andrew Jackson to negotiate with southern tribes for their removal to western lands. There was nothing in the west to help them prosper so a lot of the Native Americans died along the way (trail of tears). Im an enrolled member of the Crow Tribe so I'm pretty educated in these departments. Hope this helps!
The most likely reason Persia gave economic control to Russia and Britain was because they were torn from a revolution and needed the injection of cash and credit that this transfer would bring.