The correct answer to this open question is the following.
Although the question does not provide options or statements to answer it, we can say that Northwest Coast Indians were able to live in permanent villages because of the following factors. These North American Indian tribes from the Pacific could settle in a land where the weather conditions allowed them to grow some crops, the climate was not as extreme as in the East, and had the enormous advantage to live next to the Pacific harbor, so the could benefit from the sea. They were good fishermen and always had food for their families in the form of salmon, shellfish, clams, fruits, and some vegetables.
Justinians attempts to reconquer western territory left the east open to attacks by Persians and Slavs.
Justinian had come to the throne in 527. War with the Persians began in 540 and continued until a 50-year peace agreement was signed in 561.
The Sclaveni (as the Slavs then were known) gave Justinian problems in the Balkan region.
