Phi Alpha Theta is an honorary history society with more than 270,000 members in over 850 chapters in colleges and universities across the United States . Phi Alpha Theta ‘s mission is to promote the study of history through the encouragement of research, good teaching, publication, and exchange of learning and ideas among historians. Milligan history students established the Alpha Iota Tau chapter of Phi Alpha Theta during the Spring 2001 semester.