US oil supply dropped precipitously thanks to Covid and the Biden administration's drilling bans on federal lands, offshore drilling restrictions, cancelling oil pipelines and other blockades.

Many folks went bankrupt and US turned from a net Oil exporter to an Oil importer. The Biden administration recently started to reverse their policies in the last few months as oil prices surged. (There was also a court case loss on the federal drilling auction ban)

OPEC merrily took advantage of the state of affairs since high oil prices are good for them. Unfortunately, it will take some time for domestic supply to climb again. To tide over the state of affairs, it makes sense to open the strategic reserve. The Trump administration added 77 million barrels to the strategic reserve when the US was having an oil glut anyways, so its not as if the US doesn't have a safe buffer.