America was created by 17th- and 18th-century settlers who were overwhelmingly white, British, and Protestant. Their values, institutions, and culture provided the foundation for and shaped the development of the United States in the following centuries. They initially defined America in terms of race, ethnicity, culture, and religion. Then, in the 18th century, they also had to define America ideologically to justify independence from their home country, which was also white, British, and Protestant. Thomas Jefferson set forth this “creed,” as Nobel Prize-winning economist Gunnar Myrdal called it, in the Declaration of Independence, and ever since, its principles have been reiterated by statesmen and espoused by the public as an essential component of U.S. identity. FP_ART

By the latter years of the 19th century, however, the ethnic component had been broadened to include Germans, Irish, and Scandinavians, and the United States' religious identity was being redefined more broadly from Protestant to Christian. With World War II and the assimilation of large numbers of southern and eastern European immigrants and their offspring into U.S. society, ethnicity virtually disappeared as a defining component of national identity. So did race, following the achievements of the civil rights movement and the Immigration and Nationality Act of 1965. Americans now see and endorse their country as multiethnic and multiracial. As a result, American identity is now defined in terms of culture and creed.

Most Americans see the creed as the crucial element of their national identity. The creed, however, was the product of the distinct Anglo-Protestant culture of the founding settlers. Key elements of that culture include the English language; Christianity; religious commitment; English concepts of the rule of law,...