In an era marked by deep and intense partisan divisions, single-party control of the executive and legislative branches might seem rare. But unified government at the beginning of a president’s first term has actually been the norm, especially for Democratic presidents, according to a Pew Research Center analysis of data going back to the 56th Congress (1899-1901). In fact, it’s been the case for 16 of 21 presidents dating to Theodore Roosevelt. The five exceptions were all Republicans: George W. and George H.W. Bush, Ronald Reagan, Gerald Ford and Richard Nixon.