I am making my way through the History of England podcast (I know, pop-history, boo hiss) and it is currently covering the decline of Mercia and emergence of Wessex. My understanding is that Wessex was a primarily Saxon region, whereas Mercia, Kent, and East Anglia were predominantly Angle. With them coming under the sway of the Danelaw and Wessex carrying on the Anglo-Saxon mantle, why didn't the eventual United country emerge as Wessex, or Saxony, or something along those lines?

Thank you!