The oldest business in Wisconsin, and one of the oldest family-owned businesses in America, is Richardson Industries. They've been around since at least 1848. That was the same year Wisconsin became a state.
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“But I don’t think we could apply for a business license until WI was actually a state. So it might have been 1846 it might have been 1847. We just hang our hat on 1848 when WI became a state,” president of Richardson Industries, Justin Richardson, said.