Oswald Spengler was a #German #historian and #philosopher of history, objected the racial discrimination. In 1918, he published his best known book The Decline of the West, which proposed a new theory proposing that civilizations' life spans are limited – ultimately they decay. The Decline of the West became a bestseller in Europe and America, however, also caused a great controversy. Spengler influenced some of historians, such as Arnold Joseph Toynbee and Franz Borkenau.