The US uses metric in some places, such as the automotive industry, but it took decades to do. For a while, in the 90s, American cars were a nasty mixture of S

The US uses metric in some places, such as the automotive industry, but it took decades to do. For a while, in the 90s, American cars were a nasty mixture of SAE and metric fasteners, so you had to have two sets of wrenches to work on them. Meanwhile, not aligning with Europe (or anyplace else in the world) meant that American-made products were a hard sell since they were too hard to service.