"A very few–very few–isolated locations around the world, where it was possible to impose a rigid quarantine and where authorities did so ruthlessly, escaped the disease entirely. American Samoa was one such place. There not single person died of influenza.
Across a few miles of ocean lay western Samoa, seized from Germany by New Zealand at the start of the war. On September 30, 1918, its population was 38,302, before the steamer Talune brought the disease to the island. A few months later, the population was 29,802. Twenty-two percent of of the population died." – John M. Barry, The Great Influenza