Not to mention there have been sororities at UW-Madison since 1875.
And it's not even Wisconsin's oldest local sorority, as Beloit College's Theta Pi Gamma was founded in 1896. Of course, they weren't recognized by the university until 1908, but they were still founded earlier.
I have a feeling that this may be one of those "firsts" with lots of modifiers, like, "We're the first local sorority in Wisconsin that has stayed local throughout its entire existence."
Still, 105 years is an awfully long time for any sorority, and should be congratulated.
prdlocal -- your sorority and my chapter were founded in the same year.

1898 represent.