Because the US is obsessed with 3 and 4 way stops whenever they can (as opposed to a roundabout). It's trivial to make a roundabout have yield signs. Some road

Because the US is obsessed with 3 and 4 way stops whenever they can (as opposed to a roundabout). It's trivial to make a roundabout have yield signs. Some roads here are like that, where every 4-way intersection of stop signs is now a yield + roundabout. You can theoretically get all the way through without stopping. But you can't have yields at a 4-way stop. Connecting 2 perpendicular roads at low speed is an incredibly common problem - the US chooses to do it in a stupid way.