The main reason why Congress worked to keep a balance between the number of slaveholding states and free states is because they wanted to avoid war breaking out between the North and the South. They tried to do this through a series of compromises that ultimately failed.
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I think it would be ( They mainly stayed out of sight, but were in complete control of all matters big and small.) hope this helps.
Indentured servants are people who were in england that didn't have the money to pay for the ship ride over to the colonies. So, these people agreed to work for a weathly person (for free) for a set amount of time in exchange for the money to buy the boat ticket.
If I remember correctly, I believe the Monroe doctrine basically told foreign countries to back off and promoted isolationistic ideology.