What was the most common citizenship on board: British or American?

If you're including the crew, then the British made up by far the largest contingent by nationality of those on board, with hundreds of British crew members and only a handful of Americans. Among the passengers, there were far more Brits than Americans in 2nd and 3rd Class, with the Americans outnumbering the Brits only in 1st Class. Overall, there were more British than American passengers.