Slave state legislators had more power in what part of congress during the 1850s?

Slave state legislators had more power in The Senate, during the 1850s.

the federalist party which advocated strong centralization dominated the united states government till 1800. so 1800 election transformed the power from one party to another party for the first time and was thus a turning point in american history. so jefferson called it "revolution of 1800".

explanation:

europe would not recognize the confederacy as an independent nation.