I have experienced this every time I go out if the country for two weeks and come back. Main thing I notice is the fear I sense in people whenever cops are nearby, and definitely the sense of this security state hovering over everyone. The feeling of personal freedom I have feels like it gets wrenched away whenever I enter the US. The talk of freedom in America is basically cope for having no personal freedom. Wherever you go there's some security fuck hovering around watching and waiting for you to fuck up.