No, the quality of life that America still enjoys is the legacy of an extraordinary free market system, one of the first and still most powerful that has ever existed. That market system developed the most advanced and successful capital market in history (that no longer exists), which is why America even still has the dollar global reserve currency, because the 'ol green back
was "good as gold" for 150 years. Even today in its deteriorated form, the US monetary system is considered radically safer than all but a few in the world. That market system hinged in part on what was at the time the strongest private property rights in history, and a great judicial system to protect them.
China to this day is struggling just to emulate the kind of innovative success in free market economy that America pioneered centuries ago.
To the extent China is enjoying any success today, it's largely due to free market style reforms of their economy, attempting to abandon the destructive policies of Communism. There's no little irony in the fact that as China has moved more Capitalist, America has shifted far more Socialist (with predictable results).
Which countries did America extort from 1800 to 1965 in order to build its formerly tremendous wealth and resources exactly?
Are you talking oil? America discovered oil, and invented most of its processes. It also discovered oil in the Middle East using said technology, and that oil was then nationalized across the region and countless contracts were violated in the process.
Are you talking industrial technology? America was one of the few countries (eg along with Britain and France) leading the industrial revolution.
Are you talking computer technology? No comment even necessary.
Are you talking biotech? Again, no comment even necessary. Who did America steal its biotech from? Cambodia? Afghanistan? Vietnam? China? Panama?
Pick an industry, pick a technology, you'll find America's entrepreneurial fingerprint all over it.