Conclusion: Haven for Land-Based Gaming.South Dakota Gambling: What is Legal in the State.South Dakota Gambling: What is Legal in the State If you are looking for specific info, I recommend that you use the ‘contents’ menu below to jump straight to the topic you would like to know more about. For a complete overview, you can read the entire page. Topics on this page include land-based casinos as well as online gambling, sports betting and more. South Dakota was the third state to formalize legal casino gambling. This page will discuss the state’s gaming laws so that you know exactly what activities are legal in the state. This website breaks down all forms of gambling in South Dakota. Both of these histories share a close connection to gambling and it is no wonder that the state’s legal gambling sites are located either in historic mining towns or on Indian reservations. The state’s development has been influenced by its rich Native American and mining histories. South Dakota is a state known for its beautiful Black Hills region, stunning prairies of the Badlands National Park, and historic Gold Rush towns.