Final answer:
The first non-Greek letter sisterhood at an institution was Alpha Kappa Alpha Inc., founded in 1908 at Howard University in Washington, D.C.
Step-by-step explanation:
The name of the first non-Greek letter sisterhood at an institution was Alpha Kappa Alpha Inc. It was founded at Howard University in Washington, D.C. The year of its establishment was 1908. Alpha Kappa Alpha is the first Black women's intercollegiate Greek organization founded at a Black university.