How can capitalism fail in the US? The US isnt a capitalist country.
If the US fails it will be Socialism that causes the US to fail.
Socialism is wringing this country dry.
Creeping socialism is one of our major problems, a disease that when out of control destroys nations. The open, profusely bleeding, wound, of war in the ME, war we don't intend to win anyway, is an open, profusely bleeding, wound that's cost ten trillion over the past sixteen years is an immediate, life threatening, problem.
It's only human nature to focus on the theft you see and ignore the huge theft that's well hidden but the socialism that cost billions per year and will never go away as as long as it's such a useful tool of misdirection to hide the theft of trillions the Pentagon and Fed can't even account for.
Without the Globalist destruction of our manufacturing base and the Neocon BS about our being an empire rather than a nation, we could cure the problems that are used as bloody flags to wave in support of socialist illusions and end the rot of socialism.