Answer:
Depends which time period. But it's probably the 20th century.
The Cold War and WW2 plus others made the US impose democracy and capitalism for other countries.
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The Renaissance began in Italy partly because "Italian city-states were wealthy." It should be noted, however, that it was also because Italy was already somewhat of a cultural capital in the region.
First, technology is typically the most important contributor to U.S. economic growth.
