Trains in the US are widely prevalent! It's just that they're used for freight rather than passenger travel. The main driver behind this is the population density of the USA, cities are spaced too far apart to make passenger travel by train viable. Not coincidentally, the only area that does have significant passenger rail networks, the DC - Boston corridor, has population density similar to Western Europe.

An interesting video on this topic: https://www.youtube.com/watch?v=mbEfzuCLoAQ