Then gradually between about AD 800 and 1150,English became less like German because those who ruled England spoke first Danish and later French. These new settlers enriched the English language and especially its vocabulary. So by the 1600's Shakespeare was able to make use of a wider vocabulary than ever before. In 1620 some British settlers moved to America. Later in the 18th century som British people were taken to Australia too. English began to be spoken in both countries.
Finally by the 19th century the language was settled. At that time two big changes in English spelling happened: first Samuel Johnson wrote his dictionary and later Noah Webster wrote The American Dictionary of the English Language. The latter gave a separate identity to American English spelling.