ultra-nationalism       
noun [ U ]  mainly disapproving (also ultranationalism) uk/ˌʌl.trəˈnæʃ.ən.əl.ɪ.zəm/ /ˌʌl.trəˈnæʃ.nə.lɪ.zəm/ us/ˌʌl.trəˈnæʃ.ən.əl.ɪ.zəm/ /ˌʌl.trəˈnæʃ.nə.lɪ.zəm/
 极端民族主义
an extreme belief in nationalism (= a very great love for your country and a belief that it is better than others)
  A country's political and economic collapse might cause it to retreat into ultra-nationalism. 一个国家的政治和经济崩溃可能会导致它退回到极端民族主义。 
 The stricter citizenship laws are attributed to a rise in ultranationalism that has spread across the country. 更严格的公民法被归因于蔓延全国的极端民族主义的兴起。 
 - More examples
- People show a willingness to stand up and oppose ultra-nationalism when they vote for candidates from different ethnic backgrounds.
- The dictator's reign came at a time when the country was overcome by a wave of ultra-nationalism and xenophobia.