Research Paper (undergraduate) from the year 2020 in the subject Politics - General and Theories of International Politics, grade: 97/100, Bilkent University , language: English, abstract: Throughout history, international relations had different phases with different dominant ideologies. During the concert of Europe period, realism was the dominant ideology. Through the end of the Concert, the balance of power in Europe helped Realpolitik to flourish. After World War I, Wilsonian ideas and liberalism became the key ideology for states in both diplomatic and economic relations. If we come closer to today, during and after the Cold War period, realism and the concerns for collective security made their comeback. These two periods which were dominated by the ideology of realism had something in common and this was the importance of Bismarck's ideas about realism and his implications of realpolitik.