...the U.S.’s leading position in academic research, and the close links of universities and business, gave the country a head start in computerization in the 1970s and early 1980s, in the internet in the 1990s and in newer internet applications and artificial intelligence more recently.
Each innovation sparked a wave of investment to take advantage of it. This improved profitability and attracted foreign capital—pushing up the dollar. <Note, USD is the price of a dollar measured in foreign currencies>
Inventions don’t stay in one country for long. But in each case America’s head start gave it a few years’ lead before investments elsewhere looked as profitable.
Which lead to capital outflows and more consumption (imports), pushing down the USD, causing the cycle.
WARNING: This kind of after-the-fact theorizing is good for developing theories, but is not a substitute for testing them, i.e., correlation does not imply causality.