The immigrants to the United States in the late 20th century came from

Europe and Latin America

Explanation:

The immigrants who arrived in America during the early years of the 20th century were from Eastern and Southern Europe and Latin America. The reason for their arrival was a lack of economic opportunities in their homeland. The majority of immigrants crowded into the growing cities and towns. They came here to work as labours and to start a new life. They lived in close communities in harmony because of their language, practice their religion, and culture.

because he created electricity