there, thus forming the basis for the New England regional culture. The next mass migration was of southern English Cavaliers and their working class English servants to the Chesapeake Bay region between 1640 and 1675. This spawned the creation of the American Southern culture. Then, between 1675 and 1725, thousands of Irish, Cornish, English and Welsh Quakers plus many Germans sympathetic to Quaker ideas, led by William Penn, settled the Delaware Valley. This resulted in the formation of the General American culture, although, according to Fischer, this is really a "regional culture", even if it does today encompass most of the U.S. from the mid-Atlantic states to the Pacific Coast. Finally, a huge number of settlers from the borderlands between England and Scotland, sometimes by way of northern Ireland, migrated to Appalachia between 1717 and 1775. This resulted in the formation of the Upland South regional culture, which has since expanded to the west to West Texas and parts of the American Southwest. In his book, Fischer brings up several points. He states that the U.S. is not a country with one "general" culture and several "regional" cultures, as is commonly thought. Rather, there are only four regional cultures as described above, and understanding this helps one to more clearly understand American history as well as contemporary American life. Fischer asserts that it is not only important to understand where different groups came from, but when. All population groups have, at different times, their own unique set of beliefs, fears, hopes and prejudices. When different groups moved to America and brought certain beliefs and values with them, these ideas became, according to Fischer, more or less frozen in time, even if they eventually changed in their original place of origin. Admixture Admixture in non-Hispanic whites White Americans (European Americans) on average are: 98.6 percent European, 0.19 percent African and 0.18 percent Native American. Inferred British/Irish ancestry is found in European Americans from all states at mean proportions of above 20%, and represents a majority of ancestry, above 50% mean proportion, in states such as Mississippi, Arkansas, and Tennessee. Scandinavian ancestry in European Americans is highly localized; most states show only trace mean proportions of Scandinavian ancestry, while it comprises a significant proportion, upwards of 10%, of ancestry in European Americans from Minnesota and the Dakotas. DNA analysis on White Americans by geneticist Mark D. Shriver showed an average of 0.7%