Why are there so long queues in america to vote ?

I voted this morning here in Milwaukee, Wisconsin; it took me an hour from when I pulled up and parked to when I drove away. I had to stand in line outside for about 45 minutes, and several minutes more once inside to have my registration checked and to actually vote. I was voter number 150. There were 50 or 60 voters standing in line when I left the polling place. This was the first presidential election in which I voted since moving here three years ago. When I voted (at the same location) in 2018, there were only a few people voting, and I was in and out in just a few minutes.