Hill taught British history at Stillman College, a historically black college in Tuscaloosa, Alabama, for 18 years until 1998. Building on the views of his mentors at the University of Alabama, he published two books on the Celts, romanticizing the "Celtic" soldier. In 1994, Hill co-founded the League of the South, a pro-Southern secession organization, with Rev. J. Steven Wilkins of Auburn Avenue Presbyterian Church inMonroe, Louisiana and 39 other Neo-Confederates. The Southern Poverty Law Center considers the League of the South to be a hate group. In 1995, Hill established a chapter of the League of the South on the campus of his alma mater, the University of Alabama. With Thomas Fleming, Hill co-authored an article entitled "New Dixie Manifesto" in The Washington Post in June 1995. The "League" venerates what it calls the south's "Celtic" heritage, advocating a version of racist pseudohistory in which southerners are alleged to descend from Scottish and Irish immigrants and the "liberal" north is alleged to descend primarily from English immigrants. Michael Hill's speeches make frequent reference to the movie Braveheart, and he often states that a war between the "Celtic" south and the English north is "inevitable". In an Abbeville speech he asked the crowd "What would it take to get you to fight? … What would it take to turn you into a William Wallace?" in reference to the main character from the movie Braveheart. His supporters also support and glamorize groups like the IRA and the Scottish National Party. The notion that the south is "Celtic" and the North is "English" has been dismissed by scholars on numerous grounds. It both provides a justification for the civil war that is based on a pseudoscientific racial determinism and which also does not include the southern states explicitly seceding for the sake of preserving slavery. Furthermore it has been pointed out that proponents of the theory define numerous parts of southern and central England as "Celtic", in order to make the numbers work, and it ignores the fact that even amongst the working classes immigrants from Scotland and Ireland were massively outnumbered in the south by English indentured servants by a collective margin of roughly 5:1 and that in the 1980 census when people were asked what their ancestry or ethnicity was, a large majority of southerners self-identified as being of English ancestry. Hill tried to revive the Southern Party in 2003. A decade later, in 2013, Hill promoted "opposition to immigration and same-sex marriage." In June 2015, he spoke out in defense of slavery and white supremacy, stating that his views were backed up by science.
