The word "most" is doing a lot here. Europe guarantees consumer rights by law, while the US relies on companies adopting the practices voluntarily. Most do, but larger companies more universally than smaller, and it's by no means universal.
Don't buy if you don't like company policy, no need to have a law. There is plenty of choice in the US. Some companies even offer 90 days (again, no laws required).
It's the reality for the vast majority of larger companies. Quibbling with word choice is really not a good argument.