Final answer:
The first wave of European immigrants to the United States came from Germany and Ireland.
Step-by-step explanation:
The first major influx of European immigrants to the United States came from Germany and Ireland, starting in the 1820s. Germans came both for economic opportunity and to escape political unrest and military conscription, while many Irish immigrants were seeking refuge from the Great Famine. These immigrants played a significant role in shaping the country, forming communities and contributing to its development.