Answer:
State court in either Montana or Kansas
Explanation:
According to my research on different types of courts, I can say that based on the information provided within the question Davis needs to properly file this suit with the State court in either Montana or Kansas. This is because State Courts are responsible for handling most civil and criminal cases, such as refusal of payment like in this situation. Since the restaurant is located in Montana and the supplier is in Kansas then this lawsuit can be filed in either state.
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