After the United States Collapses, Indiana forms into its own Tiny USA with multiple states depending on the region. They switch the capital from Indianapolis to Lafayette (now Lafayette C.D.) because Lafayette is a better fit. They build many forts and quickly many people join the military and they use our manufacturing skills to build navy ships and allat.
Basically because we are a union, there will be players controlling each state and do what they wanna do (I have permission) but I control the entire country since I am the country. Also if the rp has lore about why the world just collapses, then I would say that a massive attack happened on most of the office during a state of union or something, government attacks eachother and fails to control the country, and Indiana realizes that the government failed to protect the constitution nd allat so they were the first state to gain independence