WHAT has died?
Our REPUBLIC, or our EMPIRE?
Just to ask the question shows a misunderstanding of most of the commenters here, who see our “Republic” in 18th or 19th Century “Libertarian” terms, and the “Empire” in 20th century nationalist terms (or even refer to Rome).
Neither have died. The Empire is still extraordinarily dangerous, and may become more rabid in crisis. The Republic will shamble along, or not. What is happening is that the U.S. post WWII worldwide Empire, become supreme almost by accident when war destroyed all economic opponents, was strengthened artificially when the multinational USSR collapsed — mainly of its own internal contradictions. The only thing holding our Empire together today is the U.S. military, while capitalism itself has totally overgrown national borders.
Basically capitalism today demands a world economy, and a truly international Empire. The challenge is not that China will replace the U.S., but simply that other states are industrially U.S. equals. State capitalist China will soon be (in some ways) economically more powerful. This is leading to an untenable situation like the ones before WWI and WWII.
Today there is no outside power like the U.S. to ride in to save “Democracy.” China will trade with anyone, but the U.S. is determined to maintain its declining position, and will probably resort to ever more aggressive measures to do so. The U.S. populace will scream bloody murder as its historical supremacy is challenged, but the capitalists have the whip hand as usual. Nobody on the right will ideologically challenge nationalism, and so far nobody on the left has the balls to do so either. Nothing has changed under Trump except the U.S. has gotten more hysterical. No wars ended. One more little one in Yemen added. Biden will change nothing internationally. Despite the “traitor” cries from right populists against him, Biden may prove more dangerous than Trump.
Unless political leaders arise who openly preach that capitalism and trade, freedom and liberty, require international compromise and statesmanship, and Social-Democratic reforms at home, this “Republic” will shake itself to death.