The most successful fighter of the entire war was Rittmeister von Richthofen (1892-1918). He shot down 80 planes, more than any other WWI pilot. He died after being shot down near Amiens. France's René Fonck (1894-1953) was the Allies’ most successful fighter pilot, shooting down 75 enemy planes.
Margaretha Zelle (1876-1917), also known as Mata Hari, was a Dutch exotic dancer accused of being a double agent. Though she always denied being a spy, the French executed her in 1917.
Some Americans disagreed with the United States’ initial refusal to enter WWI and so they joined the French Foreign Legion or the British or Canadian army. A group of U.S. pilots formed the Lafayette Escadrille, which was part of the French air force and became one of the top fighting units on the Western Front.
During WWI, people of German heritage were suspect in the U.S. Some protests against Germans were violent, including the burning of German books, the killing of German shepherd dogs, and even the murder of one German-American.