By being persuaded by the British with rights, the blacks joined them, and fought with and for the British side, for the promised rights.
Freedom of religion in 1812 is one of them
An all-American Expeditionary Force which was organized in WWI was perhaps considered as less challenging to fight than say a British force at least when they initially went into battle until they gained experience as they did not appear to have as much fighting experience as say the British or French who I believe entered the war earlier.
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