After the annexation of the islands, many Ryukyuans, especially Okinawans, migrated to the mainland to find jobs or better living conditions. They were sometimes met with discrimination, such as workplaces with signs that read, "No Ryukyuans or Koreans." At the 1903 Osaka Exhibition, an exhibit called the "Pavilion of the World" (Jinruikan) had actual Okinawans, Ainu, Koreans, and other "backwards" peoples on display in their native clothes and housing. During the fierce fighting in the Battle of Okinawa, Japanese soldiers committed multiple atrocities against Okinawan civilians, including rape and murder, using them as human shields, and forcing them to commit suicide. In 2007, the Ministry of Education attempted to revise school textbooks to lessen mention of these atrocities, but was met with massive demonstrations in Okinawa.