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Why did European countries seek greater unity after World War II?

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An antique black and white map of Europe from the Encyclopaedia Britannica First Edition, showing detailed outlines and place names for countries including Great Britain, France, Spain, Germany, Hungary, Turkey, Anatolia, Poland, Russia, Italy, Greece, Ireland, Iceland, Norway, Sweden, Lapland, and Denmark. The map features ornate script for the word Europe and dense labeling of regions and bodies of water. — history of Europe A map of Europe from the first edition of the *Encyclopædia Britannica*, 1768–71.

Following the devastation of World War II, European countries sought greater unity to address the profound economic, political, and security challenges that left the continent vulnerable and exhausted. The primary motivations included:123

Reconciliation and Peace: A central goal was to foster lasting reconciliation between former enemies, particularly France and Germany, to prevent the recurrence of the catastrophic conflicts that had plagued the continent.451
Economic Recovery: Europe faced severe economic deterioration, poverty, and unemployment. Integration was seen as a way to avoid the economic nationalism of the 1930s, which had contributed to the Great Depression and the rise of dictatorships. U.S.-sponsored initiatives like the Marshall Plan encouraged joint planning and cooperation as conditions for receiving aid.162
Geopolitical Standing: Once-dominant European powers found themselves dwarfed by the emerging superpowers, the United States and the Soviet Union. Greater cohesiveness was viewed as the only path to maintain political and economic influence on the global stage.1
Security: Integration, through institutions like the European Coal and Steel Community, aimed to manage key resources collectively and ensure military security in an era defined by the Cold War.452