Since 1830, when records on immigration to this country were first kept, in which decade did the largest number of immigrants legally enter this country? Give answer in a ten-year range, ending with zero.

The decade from 1901 to 1910 marked a significant period in American history, experiencing the largest surge of legal immigration this country has ever seen, with over eight million people arriving. This era dramatically reshaped the nation's demographics and cultural landscape. The sheer volume of new arrivals during these ten years surpassed any other decade since records began in 1830.

This unprecedented influx was largely fueled by the booming industrialization in the United States, which created a strong demand for labor in factories, mines, and growing cities. Immigrants were drawn by the promise of economic opportunity, higher wages, and the chance for a better life, often referred to as the "American Dream." This "pull" factor of economic prosperity was a powerful magnet for millions seeking to escape hardship in their homelands.

Simultaneously, various "push" factors compelled people to leave their countries of origin. Many immigrants during this period came from Southern and Eastern Europe, including Italy, Russia, Austria-Hungary, and Poland. They were fleeing poverty, famine, land shortages, and political instability. Religious persecution, particularly for Jewish communities in Eastern Europe, also played a significant role in their decision to seek refuge in America. The opening of Ellis Island in 1892 as the primary immigration processing center in New York facilitated this massive movement, serving as the gateway for over 12 million immigrants between 1892 and 1924, with 1907 alone seeing 1.25 million people processed.