Why were conflicts such as ww1 and ww2 major historical turning points?

World War I and World War II were major historical turning points due to their profound global impact on political, social, and economic structures. WWI led to the collapse of empires, the rise of new nations, and set the stage for political ideologies like communism and fascism. WWII further transformed the world order, resulting in the establishment of the United Nations, the onset of the Cold War, and significant decolonization movements. Together, these conflicts reshaped international relations and influenced modern society's trajectory.