Final answer:
The earliest immigrants to the U.S. came primarily from Western Europe, particularly Great Britain and Ireland. Later waves of immigrants came from Germany, other northern and western European countries, and southern and eastern European countries.
Step-by-step explanation:
The earliest immigrants to the U.S. came primarily from Western Europe, particularly from Great Britain and Ireland. However, over time, the major influx of European immigrants came from Germany and Ireland starting in the 1820s. They were followed by immigrants from other northern and western European countries, such as Germany and the Nordic countries. Later waves of immigrants came from southern and eastern European countries, including Italy, Greece, and Russia.