The United States never joined the Western European Union.
The European Union is an organisation for countries in Europe, so the US could not join. There are over 50 countries in Europe, 28 of which are members of the European Union. There is no reason why the US would even want to join the European Union. It would make no sense for them to do so.
If you are a US citizen you are the Union. Any state that may, in the future, join the Union would become US citizens. If you are referring to a workers union then it depends on the constitution of that union. There are several international ones.
Indiana was admitted into the Union on December 11, 1816 becoming the 19th state to join the union.
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Illinois was admitted into the Union on December 3, 1818 becoming the 21st state to join the union.
The European Union has the largest economy in the world at US$16,242,256,000,000
Hawaii was admitted into the Union on August 21, 1959 becoming the 50th state to join the union.
Oregon was admitted into the Union on February 14, 1859 becoming the 33rd state to join the union.
Delaware was the 1st state to join the Union. Pennsylvania was the 2nd state to join the Union.
Pennsylvania was the second state to join the Union. This was posted by Amelia
Speaker 2 : the united states has an obligation to protect its Allies from invasions
New Jersey was admitted into the Union on December 18, 1787 becoming the 3rd state to join the Union.