As we all know, the Constitutional Union Party became one of the two major parties in the United States of America during the Civil War as "War Democrats" and Southern Unionists joined the party as Copperheads gained control of the Democratic Party, but what if the Constituional Union Party didn't become a major party during the US Civil War? What PODs might be necessary for such a scenario? The Copperheads not taking over the Democratic Party (which quickly collapsed post-war outside of the South, where it limped along until the early 20th century)? Texas and Tennessee seceding? Both? What would the US political scene look like, then?