Does anyone know a time in history when two towns/cities that were warring or in dissent came together for a common purpose or aim, thereby strengthening the two?

by Futboler10
Commustar

Sorry, we don't allow throughout history questions. These tend to produce threads which are collections of trivia, not the in-depth discussions about a particular topic we're looking for. If you have a specific question about a historical event or period or person, please feel free to re-compose your question and submit it again.