A single courageous state may, if its citizens choose, serve as a laboratory

From A fond farewell to state I love that doesn't seem to love me by Charlie Kirk

Back in 1932, Supreme Court Justice Leo Brandeis wrote the following often-quoted line in the case of New State Ice Co. v. Liebmann: "It is one of the happy incidents of the federal system that a single courageous state may, if its citizens choose, serve as a laboratory; and try novel social and economic experiments without risk to the rest of the country."