Merge a branch from a different repository

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I forked a repository from another one, simply taking the files and creating another repository. I was not interested in preserving history, as it would be a completely different project. As always happen, it was not the case. So today I had to merge a branch from the old repository in the new one. As you can understand, they have no common commits, so I had to pass the --allow-unrelated-histories flag to the merge command in git

$ git merge new_remote/my_branch --allow-unrelated-histories