Why is Kansas day celebrated on January 29th

On January 29, 1861, Kansas became the 34th state in the U.S.
On January 29, 1861, the first U.S. president from Kansas was elected.
On January 29, 1861, the U.S. purchased Kansas from France
On January 29, 1861, construction of the state capital building was completed

The correct reason is: On January 29, 1861, Kansas became the 34th state in the U.S.