Theta Xi fraternity came into existence during a time of national strife, as the American Civil War was reshaping the nation. On this day in 1864, a group of engineering students at Rensselaer Polytechnic Institute in Troy, New York, recognized the need for a supportive community among themselves. They aimed to create a fraternity that focused on both academic success and brotherhood, hoping to cultivate strong relationships that would extend beyond their college years. The founders were motivated not only by the desire for companionship but also by the desire to uphold certain values of integrity, scholarship, and mutual aid in the face of the ongoing war. Since its establishment, Theta Xi has fostered a commitment to the cultivation of engineers, scientists, and leaders who would eventually contribute to society in significant ways.

The fraternity's creation under these circumstances was significant as it represented a form of resilience and continuity in the face of challenge. Members sought to maintain their focus on education and personal growth while navigating the uncertainty of the civil conflict surrounding them. Theta Xi enjoyed a unique position among fraternities, as it was the sole organization of its kind born out of an era marked by division and struggle. This foundation laid the groundwork for future chapters and initiatives that would promote both academic excellence and civic responsibility. Over the years, Theta Xi has evolved, advocating for diversity and inclusion while remaining true to its original tenets.