USA enters a commercial war with China in Africa, playing into the favors of key nations like Ghana, Botswana, and Rwanda who all in turn give minimal favors to either side (a la Egypt circa Suez). The job market (especially government-contracted workers like engineers, analysts, and middle managers) expands to exporting workers and goods to developing nations, offsetting a significant amount of national debt while skilled trades become a new alternative to a saturated white-collar job market on and off shore.
Fusion reactors become cheaper and more containable than fission or coal generators. The overabundance of electricity kills the unviable solar, wind, and natural gas industries in one fell swoop on a commercial scale, returning them all back to tinkerers and modern-age hippies to fuck around with.
This site gets that slick black theme.
Right to repair laws beat the shit out of Apple and other companies, allowing people across the globe to make mini Shenzhens and drive tech costs down.
Permaculture farms along the coasts of pescatarian regions regenerate other fish populations by accident, but ultimately reduces algal bloom frequency.
The IRS gets audited by the Treasury. Tax dollars are returned.
Contaminants like arsenic and lead become relatively easy to filter through a new type of membrane, bringing back habitability to areas once thought too contaminated to live in. This is done passively and cheaply, so land developers jump on it and empty out congested urban areas across the globe.
North Korea folds under the lack of food, and decides to conjoin with South Korea to meet basic agricultural and energy needs after China's disappointing failure to provide tractors, medicine, and other goods that most developing nations already possess.
