thommy
The United States is a federal state (or unified government).
Quote:
U.S. Constitution
Tenth Amendment
The Tenth Amendment helps to define the concept of federalism, the relationship between Federal and state governments. As Federal activity has increased, so too has the problem of reconciling state and national interests as they apply to the Federal powers to tax, to police, and to regulations such as wage and hour laws, disclosure of personal information in recordkeeping systems, and laws related to strip-mining.
https://www.law.cornell.edu/constitu...enth_amendment
Amendment X
The powers not delegated to the United States by the Constitution, nor prohibited by it to the states, are reserved to the states respectively, or to the people.
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The EU is a confederation of sovereign nations.
Simple answer:
The EU Parliament issues directives to the sovereign nations-states of the EU and those nation-states enact legislation that will enforce that directive within each nations sovereign jurisdiction.
When the US Congress legislates a law and the President enacts it by signing -- all 50 states are bound by that law. In the USA the states are compelled to obey laws as written by the Federal government.
All US Americans carry US Passports not like in the EU -- there is no EU passport only rights guaranteed by national consent of confederation. You are a citizen of France, Germany, etc ... first