But hey! We have THOUSANDS of nukes and nuke subs to launch them.

Seriously, though:

The U.S. dollar is still the world's reserve currency and will be for the foreseeable future

The U.S. will soon be the world's #1 energy supplier and power again, and will be until at least the middle of the century, if not longer. The U.S. is also energy self sufficient, and has the lowest energy costs compared to competitors, especially China.

U.S demographics aren't as dire as China, Russia, Japan or Europe

The U.S. economy is slowly rebounding. China's 30 odd year 'boom' is coming to an end, and will implode sooner than later.

Don't count the U.S. out just yet.