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The video below showing history of U.S. Senate, how they switched from party to party from 1789 till 2018. All states were split into two parts to show both of two seats each U.S. state has.
All senate classes have re-elections two years apart or put it another way one-third of Senate is elected every two years. This video above also show Senate vacancies, but only long ones (nearly a year, years) Senate majority leaders only appear the 1920s because that title didn’t exist before 1920s.
