The war also increased a sense of American unity. It brought men from different colonies together for the first time. British officers trained American ones (most notably George Washington). Legislatures and officials of the ''American colonies'''''Bold text''' had to cooperate intensively, for the first time, in pursuit of the continent-wide military effort.
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They weren't American colonies because America as a nation did not exist yet and once more, they were BRITISH colonies because they were owned part and parcel by Great Britain and administered by them, so calling them "American colonies" is technically incorrect because they were not American colonies!