
I used genealogy resources to track their ancestors to approximately 10 generations, or until the information disappears. Then I noted which countries their ancestors came from.
Virtually all of them had ancestry from many countries, not just one.
Here is a list of countries and the number of presidents with ancestry from each:
- England: 39 Presidents
- Examples: Thomas Jefferson, Abraham Lincoln, Jimmy Carter
- Scotland: 22 Presidents
- Examples: James Monroe, Woodrow Wilson, Ronald Reagan
- Wales: 19 Presidents
- Examples: George Washington, Millard Fillmore, William Howard Taft
- Northern Ireland: 13 Presidents
- Examples: Andrew Jackson, William McKinley, George H.W. Bush
- Ireland: 13 Presidents
- Examples: James Buchanan, John F. Kennedy, Joe Biden
- France: 13 Presidents
- Examples: Ulysses S. Grant, Calvin Coolidge, Franklin D. Roosevelt
- Germany: 12 Presidents
- Examples: Andrew Johnson, Dwight D. Eisenhower, Donald Trump
- Netherlands: 8 Presidents
- Examples: Martin Van Buren, Theodore Roosevelt, Warren G. Harding
- Switzerland: 5 Presidents
- Examples: Herbert Hoover, Harry Truman, Barack Obama
- Denmark: 4 Presidents
- Examples: James Madison, Zachary Taylor, Lyndon B. Johnson
- Czechia: 1 President
- Example: George W. Bush
- Estonia: 1 President
- Example: Franklin Delano Roosevelt
- Kenya: 1 President
- Example: Barack Obama
- Poland: 1 President
- Example: Gerald Ford
- Spain: 1 President
- Example: Herbert Hoover
- Sweden: 1 President
- Example: Lyndon B. Johnson








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