28 U.S.C. § 1873: Admiralty and maritime cases

In any case of admiralty and maritime jurisdiction relating to any matter of contract or tort arising upon or concerning any vessel of twenty tons or upward, enrolled and licensed for the coasting trade, and employed in the business of commerce and navigation between places in different states upon the lakes and navigable waters connecting said lakes, the trial of all issues of fact shall be by jury if either party demands it.