I'm surprised Kalleh didn't know Kaskaskia was the first state capital of Illinois.
From Wikipeia: "Kaskaskia is a village in Randolph County, Illinois, United States. In the 2000 census the population was 9, making it the smallest incorporated community in the State of Illinois in terms of population. A major French colonial town of the Illinois Country, its peak population was about 7,000, when it was a regional center and Illinois' first state capital, before the capital was moved to Vandalia in 1818."
the Mississippi flooded early in the 1800s, changing its channel and isolating Kaskaskia from Illinois. The only access to the island is from Missouri. Islanders get Illinois driver's licenses but mail is delivered via a Missouri zip code.