Final answer:
The Angles, Saxons, and Jutes were not native to Britain; they were Germanic tribes from regions that are now northern Germany and Denmark who invaded after the Romans left Britain around 400 CE.
Step-by-step explanation:
The question asks whether the Angles, Saxons, and Jutes were native to Britain based on the provided text. From the information given, we learn that after the Romans left Britain around 400 CE, there was a Germanic invasion by tribes from areas corresponding to present-day northern Germany and Denmark. These included the Angles and Saxons—who are specifically mentioned in the text—as well as the Jutes.
They invaded, raided, and settled in Britain, eventually fighting not just the native Britons, who were the Romanized, Christian Celts of England, but also the Cornish, the Welsh, and each other. It is clarified that these Germanic peoples were not native to Britain; instead, they took the opportunity to occupy the land in the wake of the Roman withdrawal.