This timeline diverges in 1936 during the tenure of President Franklin D. Roosevelt. The following list is that of the American presidents from Roosevelt through the 1980's. There is ambiguity as to if President Robert F. Kennedy wins a second term in 1972.
1933-1945 Roosevelt (D)
1945-1953 Truman (D)
1953-1961 Eisenhower (R)
1961-1963 J. F. Kennedy (D)
1963-1969 Proxmire (D)
1969-1976 R. F. Kennedy (D)
1976-1984 Reagan (R)
1984-1992 Kemp (R)