There are still no border controls between US states, even in this strange 100 mile enhanced security zone.

Please elaborate.

Immigration and Customs Enforcement asserts authority over land within 100 miles of a border (including coasts). Anyone in the US can be stopped and asked for ID and proof they're in the country legally in that 100 mile zone.

"Within the states of US"

That's implying interstate travel. Are you claiming ICE has authority to stop someone going from Georgia to Tennessee? The analogy was EU countries to US states, and specifically did not include international US borders.