The failure of collective security refers to the breakdown of international cooperation to maintain peace and prevent aggression among nations. This concept became particularly evident in the lead-up to World War II when nations failed to unite effectively against acts of aggression, leading to unchecked expansion by totalitarian regimes. The inability of countries to come together and enforce collective agreements weakened the prospects for peace, ultimately paving the way for conflict, exemplified by the invasion of Poland in 1939.
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