To which political party did thomas jefferson belong

Jefferson belonged to the Democratic-Republican party that he founded. He also opposed the Federalist party and did not approve of it.

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Thomas Jefferson belonged to the Democratic republican party.
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The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.