America BecomingAmerica Becoming The 20th Century has been marked by enormous change in terms of how we define race. In large part, we have thrown out the antiquated notions of the 1800s, giving way to a more realistic, sociocultural view of the world. The United States is, perhaps more than any other industrialized country, distinguished by the size and diversity of its racial and ethnic minority populations. Current trends promise that these features will endure.