The answer no one bothers admitting or talking about. Systemic corruption, abandoning Austrian economics (strict solvent monetary policy) for endless debt creation and reckless governmental spending, the legalization of political lobbying, decades of industrial outsourcing, decades of government ignoring anti-trust laws that would have prevented monopolization of the economy and effective Marxist media brainwashing that created a majority demographic of highly indebted college "educated" fools across the country.
It was very simple to bring down America. Get us involved in never ending failed wars. Outsource our industries to countries like Vietnam, South Korea and China. Bribe Congress to recklessly spend and grift while indebting the entire nation. Regulate common sense policy out of existence and/or making it illegal. Opening up the borders to flood the country with cheap labor from the third world. Create a federal student loan program based on lies and plunge future generations into debt slavery. Lie about the economy, rig the statistics, say everything is normal and fine while the sky falls and reality crashes down on the masses. Keep people politically divided so they never blame the true culprits, their own politicians, their own government.
Who would have thought it would have been so easy?