Pan-Slavism, a belief that the Slavic peoples of eastern Europe should have their own nation, was a powerful force in the region. ... It was this pan-Slavic nationalism that inspired the assassination of Archduke Franz Ferdinand in Sarajevo in June 1914, an event that led directly to the outbreak of World War I.
Presidents nominate diplomats and negotiate treaties, but the Senate determines whether those nominees will serve or if those treaties will be ratified.