Answer:
Horrors of ultranationalism left memories of shameful acts in the history of mankind.
Step-by-step explanation:
Ultranationalism occurs when nationalism is pushed to an extreme level in which, under one dominant elite, citizens are driven into a dictatorship. Ultranationalism in pursuit of global prosperity resulted in racism and genocide. we have witnessed many countries adopt ultranationalism which has led to numerous incidents of inhumanity including the Holocaust, Saddam Hussein's attack on the Kurds, the Armenian genocide, etc.