1. Through the 1800s, about 5 million people immigrated to North America from what is now southwest Germany, including President Trump’s grandfather, Friedrich, who moved to the United States in 1885.
2. Researchers at Germany’s University of Freiburg analyzed 19th-century migration from central Europe to North America, and discovered new evidence suggesting climate change played a major role in spurring mass movements of people.
3. Trump left Germany for the United States in 1885, when a changing climate was one of the factors encouraging migration, according to researchers.
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