Can the US Government be overthrown?

If the nation's ideals-which it was founded on-are violated to an extreme degree, and a powerful uprising and powerful (with many many members) rebel army was formed, then the capital at D.C. could be militarily taken over, which would lead to the overthrow in government, and the restoration of America. But-this is highly unlikely to happen now, or until something drastically bad happens to the American Constitution/way of governing the nation.