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State Abbreviations – 50states
USA States (Two-Letter Abbreviations) - WorldAtlas
List of U.S. states and territories by area - Wikipedia
List of regions of the United States - Wikipedia
List of U.S. state and territory abbreviations - Wikipedia
U.S. state and territory abbreviations | List, Postal Abbreviation ...
AP Style State Abbreviations - Writing Explained
Do You Know the Different Regions of the US? - ThoughtCo
U.S. States Ranked by Area - ThoughtCo
50states.com – States and Capitals