The R.M.S. Lusitania
When the Lusitania debuted in 1906, it was one of the world’s biggest passenger liners. Boasting a gross tonnage of 31,550 tons, the British ship was designed to carry more than 2000 passengers and upwards of 800 crew. It was quick, too: The Lusitania set a new industry standard in 1907 by crossing the Atlantic at an average speed of 23.99 knots. But of course, the ship is best remembered for its final voyage.
On May 7, 1915—early in World War I—the Lusitania was chugging past southern Ireland when a German U-boat sank it. The attack claimed over 1100 lives, including those of 128 Americans aboard the ship. The sinking helped turn public opinion in the U.S. against Germany. America eventually entered the war as an ally of Great Britain in 1917.