(The actual group to which Jefferson belonged was the anti-Federalists. The party he helped found was the "Democratic-Republicans", one faction of which became the Democratic Party, and the other the Whigs. )
Thomas Jefferson was neither Republican nor Democrat because the political platforms of these two parties would not have stood a chance in his time. The two parties have been hopelessly authoritarian and unworkable, and they would have been in his time. He was effectively a liberal, secular humanist, which would be closer, in today's world, to the Democratic Party.
Perhaps this will help
Jefferson can be described as an anti-Federalist, while Hamilton was a Federalist. Jefferson believed in a small but powerful peacetime navy, no peacetime army, and minimal government intrusion in people's lives. If Jefferson were alive today, he would most likely be a Libertarian.
Jefferson was not a Republican or Democrat in the modern sense.
Both parties have changed significantly since the founding of the U.S. Jefferson and his followers favored states' rights and a strict interpretation of the Constitution, which Republicans support today, but Jefferson also favored economic policies that benefited the working class and disapproved of policies that benefited wealthy merchants and bankers, which Democrats support today. Jefferson also believed that a powerful central government and military posed a threat to individual liberties, which is a blend of what Democrats and Republicans believe today, since Republicans oppose a powerful centralized government but support a powerful federal military and the restriction of civil liberties including bans against Gay marriage, abortion and medical marijuana-while Democrats support a centralized government but oppose an aggressive military foreign policy and government laws that restrict civil liberties.
Not sure, but I had to alter the current answer as it said that those political parties did not exist. They did exist, except the Democratic party was called the Federalist party.
The strongest division between the parties was that Federalists wanted D.C. to have total control over the country, while the Republicans wanted states to have the majority of control over their people with the federal government establishing baselines of law throughout the country (Bill of Rights)
Thomas Jefferson was a democratic republican.
Thomas Jefferson was an anti-federalist. He was a democratic republican therefore he couldn't be a federalist.
Along with Thomas Jefferson, James Madison was a Democratic-Republican.
Thomas Jefferson was a domocratic-republican, so his principles were different from the federalists.
Alexander Hamilton and James Madisonedit: this is not correct. The Federalist Party was founded by Alexander Hamiltion and John Adams. (James Madison, best buddy of Thomas Jefferson, founded the Democratic-Republican Party)
yes thomas jefferson was a democrat republican.
Thomas Jefferson was an anti-federalist. He was a democratic republican therefore he couldn't be a federalist.
Along with Thomas Jefferson, James Madison was a Democratic-Republican.
Because he was Republican, so that's why the Federalist wouldn't accept Jefferson's plan.
In the US political parties were founded by Thomas Jefferson and Alexander Hamilton with the Democratic Republican and Federalist Party
Thomas Jefferson was a domocratic-republican, so his principles were different from the federalists.
Thomas Jefferson - Republican Alexander Hamilton - Federalist
Thomas Jefferson was co-founder and leader of the Democratic-Republican party. The party supported a strict interpretation of the Constitution, neutral relations with European powers, and stronger state governments. Its main opposition was the Federalist Party.
Thomas Jefferson was originally a member of the Democratic-Republican party, which was the predecessor of today's Democratic Party. He later founded the Democratic-Republican party, which stood in opposition to the Federalist party and advocated for limited government and states' rights.
Republican
Thomas Jefferson wanted Democratic Republican judges and not Federalist judges.
James Madison and Thomas Jefferson started the Democratic-Republican party (but they just called it the Republican party). They created the Republican party to oppose the Federalist party. The Republican party that they created was the second political party in the United States.
Alexander Hamilton and James Madisonedit: this is not correct. The Federalist Party was founded by Alexander Hamiltion and John Adams. (James Madison, best buddy of Thomas Jefferson, founded the Democratic-Republican Party)