When Trump indicated a 100% rate, there would certainly be some type of retaliation. I read yesterday that China recently sold dollar-denominated debt securities to the Saudi Arabian market, and that this plan aims to reduce the dependence of countries that maintain more productive relations with China, but still maintain many relationships of financial dependence with the United States. Indebted poor countries could refinance their external debts via China with countries that have foreign savings, such as Saudi Arabia, detaching themselves from the United States in this context. This would concentrate the demand for dollars in China (Chinese sell manufacturing to the US and obtain dollars), which would operate the new dollar system without the United States. US reactions would tend to further isolate the country. The only viable reaction would be to reindustrialize and return to hegemonizing trade with the Global South