In 1925, General John J. Pershing was sent to help resolve the Tacna-Arica border dispute between Peru and which country?

By 1912, after the "scramble" for which continent, Britain and France controlled most of it? In 1912, which Native American athlete won both the Olympic decathlon and pentathlon? Which German physicist developed a counter for detecting radioactive particles, later improved with Walther Müller in 1… Radio station WSBT, launched by the South Bend Tribune in 1922, broadcasts from which state? In 1933, which future "Yankee Clipper" hit safely in 61 straight games for the San Francisco Seals? In 1933, the mercantile agency founded by which man merged with competitor R.G. Dun & Company? In 1937, which artist painted a masterpiece depicting the bombing of the Spanish town of Guernica? In 1940, at age 84, who became head of the French government, only to be tried for treason after the war?