The terrible side of human capabilities and conduct that was revealed during World War I should never be replicated. There was an unparalleled amount of death and destruction as a result of the employment of new technologies. The war demonstrated how capable humans are of using severe violence and ignoring innocent people and prisoners of war. Authoritarian governments and the degradation of civil liberties were additional consequences. Misinformation and propaganda encouraged nationalism, xenophobia, and the demonization of rival countries and ethnic groups, which led to crimes against civilians and POWs, as well as mass murder and forcible eviction of ethnic minorities. The lasting effects of World War I serve as a caution against nationalism, militarism, and bigotry as well as a reminder of the need of cooperation, diplomacy, and respect for human rights in averting conflict and fostering peace. It is important to learn from the past and work towards a more peaceful and just world for future generations.