In what way does banneker compare the american colonies to slavery?

Benjamin Banneker was a brilliant, self-taught African-American astronomer and mathematician.

In a letter to Thomas Jefferson, he points at the contradiction between the high ideas incorporated into the Declaration of Independence and the Bill of Rights, and the persistence of slavery.  Banneker used religioius arguments against racial opression, stating that all men are created equal by God.

Explanation:

Jefferson believed that small farmers should control the West. The Land Law of 1800 reduced the minimum individual purchase of land in the West to 320 acres. That minimum was slashed to 160 acres in 1804, and again in 1820 to 80 acres.