> The US economy depends on the country's position of world hegemon
Citation needed? This feels like a retcon. Remember that the U.S. became the biggest economy in the world in 1890: https://www.digitalhistory.uh.edu/disp_textbook.cfm?smtid=2&.... That was half a century before World War II and the military empire that followed.
The trillion dollars a year pumped into the military support the stock prices of quite a few highly-valued companies. A sudden collapse of hegemony would be bad for "the market", but that seems unlikely unless WW3 actually kicks off instead of a few more rounds of opportunistic snatching and bullying by the big countries, and in that case few people would care about the stock market.
That seems like an application of broken windows fallacy.