Indeed so. Two major invasions after the Romans left around 410 AD: Angles and Saxons, followed by the Vikings, both of whom settled in "England", led to several different kingdoms - Wessex, Mercia, Anglia, Northumbria (and that doesn't count the Celtic kingdoms like Cornwall and Wales). The fortunes of each waxed and waned until Athelstan united them (i.e. conquered them) in 927.<quoted text>you are a wealth of information and you tell the story well ....
SO england was not one day just proclaimed as a country?
It sounds like some effort went on for a long time to create some sort of unification of the neighbouring smaller kingdoms?
With the Norman invasion of 1066 (they were direct Viking descendants, William was Duke of Normandy, not King of France, which was Philip) and the subjugation of the country, we have a clear line that runs through (via Scotland, Holland and Germany) to the monarchs of today. Ironically, for three centuries after that invasion, the nobs spoke French, not English as language of choice.