Born to prevent war, UN at 75 faces deeply polarized worldBorn out of World War II's devastation to save succeeding generations from the scourge of conflict, the United Nations officially marks its 75th anniversary Monday at an inflection point in history, navigating a polarized world as it faces a pandemic, regional conflicts, a shrinking economy and growing inequality. Criticized for spewing out billions of words and achieving scant results on its primary mission of ensuring global peace, the U.N. nonetheless remains the one place that its 193 member nations can meet to talk. Secretary-General Antonio Guterres, looking back on the U.N.'s history in an AP interview in June, said its biggest accomplishment so far is the long period during which the most powerful nations didn't go to war and nuclear conflict was avoided.