Final answer:
The largest number of new Americans in recent decades has come from Asia and Latin America, with significant numbers arriving from Mexico. Early in the 20th century, European immigrants dominated, but by the end of the century, the trend shifted towards the Americas and Asia.
Step-by-step explanation:
In recent decades, the largest group of new Americans has come from Asia and Latin America, specifically countries such as Mexico. Although historically, most immigrants to the United States were from Europe, there has been a significant shift. Early in the twentieth century, European immigrants accounted for more than 90% of all immigrants, but by the end of the century, the figure dropped to less than 20%. By the 2000s, about half of U.S. immigration came from the Americas, notably Mexico, and roughly a quarter from various countries in Asia.
The United States continues to be a major destination for immigrants worldwide, with a significant number coming as political refugees or in search of better economic opportunities. U.S. immigration policies, such as the Development, Relief, and Education for Alien Minors (DREAM) Act and the Deferred Action for Childhood Arrivals (DACA), reflect the ongoing evolution of attitudes and regulations pertaining to new Americans.