These are the years the current nationals came on campus at Thiel College:
Fraternities
Sigma Phi Epsilon- 1948
Alpha Chi Rho- 1958
Kappa Sigma- 1996
Delta Sigma Phi- got their charter back this past spring
Sororities
Chi Omega- 1950
Sigma Kappa- 1954
Alpha Xi Delta- 1959
Zeta Tau Alpha- 1964
I don't know about the previous nationals that lost their charters... I only have info on the ones currently on campus!