In North America, language usage norms in the colonies stayed those of the motherland until roughly the American Revolution (1775–1783). Afterwards, American English (AE) was no longer a variation of London English, but it got into its national period. Major pleas in defense of AE are then presented, a devotion which enclosed immigrants' duty to learn it instantly, and protected against the intrusion of any other language. Political independence (I) was swiftly succeeded by cultural I.