noun
ultranationalism
Political ideology advocating extreme nationalism, often associated with expansionism or authoritarianism.
超国家主義は戦争を引き起こす危険がある。
Ultranationalism carries the risk of causing war.
国家主義 is nationalism in a general sense, while 超国家主義 is an extreme, often aggressive form of nationalism.
Compound of 超 (chō, 'ultra-') + 国家主義 (kokkashugi, 'nationalism').