What did Tom Watson bring an end to?

Tom Watson bring an end to bipartidism in America, as he was one of the leaders of the Populist Party.

Explanation:

Tom Watson was an American politician who represented the state of Georgia in both houses of the United States Congress, and was the vice presidential candidate of the Populist Party in the 1896 American presidential elections. At the turn of the century in 1900, it nominated Watson as a presidential candidate in the presidential elections of 1904 and 1908. Watson was described for the first time as an advocate for poor farmers and workers, as well as being a politician with clear socialist convictions; but over the years he became increasingly known for his anti-Catholic and racist views.

this isnt

sumerians were responsible.