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In page East Anglia:

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Parts of East Anglia remained marshland until the 17th-century drainage of the Fens, despite some earlier engineering work during the Roman occupation. The alluvial land was converted into wide swaths of productive arable land by a series of systematic drainage projects, mainly using drains and river diversions along the lines of Dutch practice.[citation needed] In the 1630s, thousands of Puritan families from East Anglia emigrated to New England in America, taking much East Anglian culture with them that can still be traced today.[9] East Anglia based much of its earnings on wool, textiles, and arable farming and was a rich area of England until the Industrial Revolution caused a manufacturing and development shift to the Midlands and the North.