Suppose that the confederate states never rejoin the US, but magically politics are the same in the non-Confederate states.
We have no TX, OK, AR, LA, MS, AL, FL, GA, TN, SC, NC, VA
Electoral vote
* indicates from south
# means solid south
Bold indicates different from real life
1868: Grant beats Seymour 173-64
1872: Grant beats Greely 236-23
1876: Hayes really beats Tilden 166-108
1880: Garfield beats Hancock 214-60 #
1884: Blaine beats Cleveland 182-75 #
1888: Harrison beats Cleveland 233-61 #
1892: Cleveland betas Harrison, Weaver 163-145-22 # election thrown
1896: McKinley beats Bryan 271-62 #
1900: McKlinley beats Bryan 292-41 #
1904: Roosevelt beats Parker 336-20 #
1908: Taft beats Bryan 321-35 #
1912: Wilson beats Roosevelt, Taft, 299-88-8 #
1916: Hughes beats Wilson 254-147 #
1920: Coolidge beats Cox 382-13
1924: Coolidge beats Davis, LaFollette 382-0-13 #
1928: Hoover beats Smith 372-23
1932: Roosevelt beats Hoover 337-59 #
1936: Roosevelt beats Landon 388-8 #
1940: Roosevelt beats Wilkie 314-82 #
1944: Roosevelt beats Dewey 295-99 #
1948: Truman beats Dewey, Thurmond* 205-189-0
1952: Eisenhower beats Stevenson 377-18
1956: Eisenhower beats Stevenson 382-13
1960: Kennedy beats Nixon 222-179
1964: Johnson* beats Goldwater 397-5
1968: Nixon beats Humphrey, Wallace* 236-166-0
1972: Nixon beats McGovern 383-17 #
1976: Ford beats Carter* 220-179 #
1980: Reagan beats Carter* 363-37
1984: Reagan beats Modale 379-13 #
1988: Bush* beats Dukakis 280-111 #
1992: Clinton* beats Bush* 331-52
1996: Clinton* beats Dole 328-55
2000: Gore* officially beats Bush* 272-211(officially #)
2004: Kerry beats Bush* 252-126 #
People like Johnson, Carter, Clinton and -- thankfully -- the Bushes never run in this scenario.