Where a suit by a Native American tribe sounded in contract law, a six-year statute of limitations applied. Further, the tribe did not enjoy sovereign immunity in litigation against Wisconsin.The 7th U.S. Circuit Court of Appeals affirmed a decision by Chief U.S. District Judge James D. Peterson, Western District of Wisconsin.Since 1992, the Stockbridge-Munsee Community, a federally recognized Native American tribe, has conducted gaming at North Star Mohican Casino Resort in Shawano County, Wis., northwest of Green Bay.In …