The key phrase in your statement is "a long time ago." The situation was different then as were the people involved.
Now is not the time for an armed revolution. Try to start one and see how far you get. I am a patriot and I would not join you. We still have legal options left.
I'm just saying that Americans are not exempt from human nature. Human nature tends to entropy of government and societies. Entropy leads to destruction. Destruction leads to rebirth. God only knows what would result.
We as Americans tore ourselves apart in a big way in the 1770-80's, in the 1860's, and (in a way) the 1960's. It would be naive to assume it won't happen again. We're not immune from history's cycles.