The answer is the cotton gin i am pretty sure
hope this helps (:
Pattern and rhythm
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You are most likely referring to the assassinations of Martin Luther King Jr and Malcolm X. The impacts of both of their assassinations was that the Civil Rights movements actually grew stronger, with more African Americans and white Americans coming together to fight for equality on the streets, in Presidential elections, and through activism in Churches. Both MLK and Malcolm X were good men who fought for the rights of African Americans, and they will forever be remembered for their lasting impression on this nation, not only by other African Americans, but by all Americans.
If this refers to the democratic republic body of governance like in the U.S. Then from the three body; executive, legislative and judicial. I would presume that the executive has varied greatly over the years, in that, there can be changes from the office and people in power.