<Ul> <Li> President Pro Tempore Orrin Hatch (R) </Li> </Ul> <Li> President Pro Tempore Orrin Hatch (R) </Li> <Ul> <Li> President Pro Tempore Emeritus Patrick Leahy (D) </Li> </Ul> <Li> President Pro Tempore Emeritus Patrick Leahy (D) </Li>

Which created a federal system of government in the united states