Which fraternity was founded during the Civil War?

Theta Xi was founded during the Civil War, specifically in 1864, at Rensselaer Polytechnic Institute in Troy, New York. This context is significant as it places the fraternity's origins amidst a tumultuous period in American history, reflecting the social and cultural dynamics of that era. The founding of Theta Xi was influenced by the need for camaraderie and support among students during the challenges posed by the Civil War. The fraternity aimed to foster brotherhood and academic pursuit, which were crucial during such difficult times.

In contrast, the other fraternities mentioned were founded at different times; Alpha Delta Phi was established in 1832, Kappa Sigma in 1869, and Phi Kappa Psi in 1852, each reflecting varying historical contexts. Therefore, Theta Xi's founding during the Civil War sets it apart as an organization born out of a unique and challenging period in U.S. history, illustrating its significance among fraternities.