The Declaration of Independence was just that. A Declaration of Independence from England's Monarchy. Our Constitution set up our federal laws via the Bill of Rights (the Amendments).FYI, this isn't other Nations. THIS Country's founding philosophy, the Declaration of Independence, clearly states MY beliefs- the right to Life, Liberty and the pursuit of Happiness- there are NO caveats- vs your apparent beliefs that you and your kind (authoritarians) are omnipotent and can declare that other humans don't have inherent Rights- kinda like George Soros, not to mention the Empty Suit brigade that infects the District of Criminals.If you travel to any nation, you MUST have a passport and in some cases, a visa. The nations aren't "police states." They believe that if someone wants to enter their nation, they should try to be sure that the people traveling to them aren't fleeing arrest warrants, known terrorists, murderers, rapists, robbers, et cetera. It's common sense.
You're no doubt one of the "George Soros" Free Movement of Peoples crowd. Once nations like Hungary, Poland, Czech Republic and Slovakia, saw what carnage and deaths that was occurring by the EU allowing the George Soros concept to play out, they closed their borders and refused to let in any migrants, despite the EU's objections. Result...no similar problem. No terrorist activities. Now, Italy is getting tough on it and has tossed out thousands of migrants and has loosened its gun restrictions so that the Italians can protect themselves.
As to the right to life, liberty and the pursuit of happiness, you do have the right to live, be free to move around the country, even leave the country at will and pursue happiness, providing your pursuit of happiness isn't committing crimes against others.
If you're looking for true police states, look no further than, North Korea, China, Vietnam, Venezuela, Cuba, Islamic nations and any nation run by a military junta.