User blog comment:Mr. Youtube/Columbia and Rapture/@comment-76.180.224.33-20131208053212

Actually if you read the bioshock novel which is canon it says that Andrew Ryan created rapture as a way to escape the Cold War and all the hate and war and wanted to create a utopia at the bottom of the ocean then slowly rise up and soon take over the world Columbia is an alternate version of rapture both were created to start a new way of life