The Territory of Indiana was established May 7, 1800. Admitted as the 19th state, Indiana achieved statehood December 11, 1816. (Brit; Wiki)
See also: https://www.britannica.com/place/Indiana-state
The graph displays the other subjects mentioned on the same pages as the subject "Indiana". If the same subject occurs on a page with "Indiana" more than once, it appears closer to "Indiana" on the graph, and is colored in a darker shade. The closer a subject is to the center, the more "related" the subjects are.