Answer:
The answer is Islam spread.
Natural, it is not man made.
Answer:
Not Pacific Coast or Midwest
Explanation:
The majority of the non- Anglo migrants throughout the 19th and 20th century were avoiding the West and Pacific Coasts because they were looking for the jobs, not for land. Majority of the immigrants came from Central, Eastern and Southern Europe. They all worked in the industries on the East side of America to earn a living to start a new life. Between 1880 and 1920 the country saw rapid industrialization and urbanization.
Volcanic eruptions and/or earthquakes caused by the shifting of tectonic plates
