How is american literature of the seventeenth and eighteenth centuries different from the literature written in britain?

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The seventeenth and eighteenth centuries were both turbulent and polite; it was an age of virtuosos and pretenders; of [ libertinism and enlightenment, of reason and romanticism. It witnessed the rise of the novel, the birth of the modern encyclopedia, the cult of sensibility and the crafting of some of the sharpest satire in English.

It has uniquely American themes.
Besides the literature clearly reflected national characteristics of Americans - their practical, utilitarian morality and native cheerful humor, very different from the sarcastic, surly humor Englishmen