Conversation so far:
Which University did Sherman Alexie go to ?
His successes in high school won him a scholarship in 1985 to Gonzaga University.
Did he go to any other University ?
In 1987, he dropped out of Gonzaga and enrolled at Washington State University (WSU).
Did he get a degree from WSU ?
However, in 1995, he was awarded a bachelor's degree from Washington State University.

Question: What did he study at WSU ?
Self-contained rewrite: What did Sherman Alexie study at WSU ?