I beleive it was because he wanted to see his parents...I think???
These groups hoped to drive Austria-Hungary from the Balkans and establish a 'Greater Serbia', a unified state for all Slavic people. 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.
Answer:
A Green party is a formally organized political party based on the principles of green politics, such as social justice, environmentalism and nonviolence.
hope it helps you