You tried to compare the US to Europe impying that US states are functionally equivalent to countries of Europe, sharing only currency but differing in laws and society (and, weird example you gave, the people they hate). Cultural differences in the US are largely regional, usually having little to do with the borders of a given state. The federal government is made up of officials elected and appointed from all states and is governing over all of the US. Laws enacted by Congress aren't then approved or enforced by state legislatures, they are decided by those elected to the national legislative body by all citizens of the US. So yes, this is a country where matters are largely decided at the federal level. You overestimate the influence and power of state (and local) governments.
Maybe you'll visit some day and see what it's actually like!
I can visit, I will probably do it but this will not teach me everything's in two weeks or more. What you didn’t understand (my bad explanation) with my statement is that people can live in a big country, have almost the same rules, votes globally etc. there still will be a huge difference between culture of people (rich, poor, etc.) It’s why the EU is falling down, everybody does not pull at the same rope. People still use history to say that they are a country when we are just the same, human mixed by a million of years of sex. It’s just a loop, “country” like cells get bigger, fall and split. Let’s do it again and hope that we can do things globally.
Maybe you'll visit some day and see what it's actually like!