There are lots of differences between Sweden and the USA.
For the first it's really hot in the USA. In Sweden it's mostly raining or cloudy. In the summer the sun comes out but it's rare that the temperature goes over 95 Fahrenheit.
In the USA they more dangerous animals. Like snakes who can jump twice their size and spiders whose bite can harm really bad. In Sweden we have like three different types of snakes. And only one of them i venomous. We have venomous spiders to but only in the zoo's. In Sweden we don't have so many dangerous animals, At least not compared to the USA. Not even the wolfs are harmful to humans. Sure, they kill animals but a wolf haven't killed a human since 1881 in Scandinavia. And we have one venomous fish. But the worst that can happen is that the you can get the worst pain the your life but you can't die or anything. So if I had to choose between Sweden and the USA depending on the animals I would definitely choose Sweden.