"I personally think (America) will collapse like Rome or the U.S.S.R."

So over hundreds of years like Rome, or tomorrow like the Bolsheviks. But it can't be like the USSR's collapse because the state formally controlled everything there. Everything that was purchased legally was either manufactured or imported and distributed by the Soviet government. After it fell, the gangsters who were running the real economy, the black market, moved in and took over.

In the USA everything is manufactured and distributed by private entities that are not controlled by the government, only regulated. There are also the 50 state governments and tens of thousands of municipal governments that are independent of the federal government that actually provide most government services. Hooray for capitalism and federalism.