The effect of the English Civil War on the American colonies was by permitting the colonies to essentially govern themselves.
Salutary Neglect was the policy of the British government from the 1600s to allow the colonies to essentially govern themselves so long as they maintained loyalty to the crown.
The English Civil War in the 1600s was the cause of this as the government had to concentrate on Britain itself and so allowed colonies like the American colonies to get away with a lot.
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