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All answers having "United States" as clue:

5 Character Answers:

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THESE



7 Character Answers:

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MERGERS



8 Character Answers:

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REPUBLIC



9 Character Answers:

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ETATSUNIS



10 Character Answers:

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ALABAMAINE

VERMONTANA



13 Character Answers:

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HARRIETTUBMAN



15 Character Answers:

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NEWMEXICOLORADO