Of the 37 Presidents of the United States before Jimmy Carter, at least 18 0r 21 (depending on which source you believe) were close relatives. That comes between 48.6% and 56% - far too much to be a coincidence, as any conspiriologist (or mathematician) would tell you.
Not only was John Adam, who helped design the Great Seal, related to F.D. Roosevelt, who put it on the dollar bill, but even a seeming outsider such as Richard Nixon was related to James Monroe; Three Presidents were cousins (Franlin Pierce, James Garfield and Grover Cleveland); and William Henry Harrison was related to Jefferson, Jackson Tyler and Benjamin Harrison (his grandson). Calvin Coolidge, Harry Truman, and Lyndon Johnson were more distantly related to Jefferson, Jackson, and the Harrisons.
The Roosevlt and Delano families, who ggave us the only president eleceted to four terms, were related to Grant, Washington, Van Buren, and Taft. Of the 244 ancestors in the family tree of 21 presidents we find 13 Roosevelts, 16 Coolidges and 14 Tylers. Another source manages to relate 60% of the presidents and link most of them to the super-rich Astor family.
This data does not include the genealogies of the four [at time of writing] presidents Carter Reagan, Bush, and Clinton, which we have not found; but Clinton is related to the Rockerfellers according to some sources[...]
Psychologist G. William Domhoff claims that a large part of American's ruling elite, just like that of Europe, are related by marriage