Answer:
In 1775, Jefferson was elected to the Continental Congress, a revolutionary assembly made up of delegates from the 13 colonies. Thomas Jefferson wrote the Declaration of Independence, which officially declared that the American Colonies were completely free of British authority and influence.
As a republican country, we vote for government officials in our house of representative to fight, and represent our beliefs.
Technically this is true in the United States, since before westward expansion there were land restrictions on which white men could vote--but since practically all white men in the west owned land this was not the case.