Is America moving towards a social democracy like Denmark because of the failure of capitalism?

Denmark also has a capitalist economy. Social democracy and capitalism do not exclude each other.

Capitalism has not failed as such. Laissez-faire has failed, deregulation has failed and runoff has brought the country to the brink of bankruptcy, but the real cause of our crisis lies in the fall of the Republican Party in neo-Nazism, which began with Newt Gingrich and continues since the beginning of his looting mandate. Dixiecrats and Klan.

The end result may be Trump, but it's Gingrich who wrote the Manifesto and started trying to make America a one-party state with a supreme leader above the law. We should never forget it.