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This organization still exists in OTL, but is in the process of being merged into EU functions. However, what if pan-European initiatives in the 1950s and thereafter had been based off expanding and deepening the WEU rather than the ECSC?
Firstly, you'd have a union more focused on joint defence (which might make NATO somewhat redundant, or else reduce it to a bilateral treaty between the WEU and the US) and one in which there is British participation from the beginning. Not to mention what if the European Defence Community had passed.