Philadelphia is a city. Cities did not take independent action to join the Union on their own.
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Pennsylvania joined the United States of America in 1787. This state was one of the thirteen colonies in the Revolutionary War.
The first state in the United States was Delaware.
None of these. Florida was the 27th state to join the union.
New Mexico was the 47th state to join the union in 1912.
Texas was admitted into the Union on December 29, 1845 becoming the 28th state to join the Union.
Hawaii was admitted into the Union on August 21, 1959 becoming the 50th state to join the union. Alaska was admitted into the Union on January 3, 1959 becoming the 49th state to join the Union.