1. This speech was given on his resignation from the Army on December 23, 1783, well before the establishment of our present national government by the Constitution. While your statement was accurate at the time he gave the speech, its applicability to today is at the very least debatable.
2. In the Dred Scott decision of 1857, the Supreme Court announced that certain groups of people could never become citizens of the United States, regardless of their status as citizens of an individual State.
My mistake. Your quote was from his farewell speecth in 1796, not his speech resigning command of the army in 1783.