Ironically the USA is known for historically having the least amount of legal barriers to allow for citizenship.

All other countries across the globe have austere strict policies because they dont want large quantities of immigrants that are unable to contribute back.

Sorry to burst your bubble, everyone else is unwilling to accept the amount of immigrants equivalent to what USA allows because the other countries dont want their taxes and well paid social welfare programs to help with people that aren't part of their own society, nor has paid into it like its own citizens have done. It's as simple as that.

The only type of immigrants that all countries want are wealthy ones or highly educated ones. They could not give two fucks about working-class immigrants because their own countries already have plentiful amounts of us peasants.