Union Party References Union Party political party, United States Ask Anything Homework Help Written by The Information Architects of Encyclopaedia Britannica The Information Architects maintain a master list of the topics included in the corpus of Encyclopædia Britannica, and create and manage the relationships between them. The Information Architects of Encyclopaedia Britannica Britannica AI Ask Anything Learn about this topic in these articles: War Democrat…with Republicans in forming the Union Party, which renominated Lincoln for president and selected War Democrat Andrew Johnson of Tennessee as Lincoln’s running mate. Read More…with Republicans in forming the Union Party, which renominated Lincoln for president and selected War Democrat Andrew Johnson of Tennessee as Lincoln’s running mate. Read More