Byzantium/Constantinople was conquered in 1451, but the empire continued to decline starting around the 18th or 19th centuries. It officially died in WWI. As for how long it was a major threat to Europe, the empire's prime was the 16th century, under Suleiman the Magnificent.
Answer:
The Britain,France and the United States embrace the policy of appeasement because they believed that Hitler demands would stop any future pursuits of territories.
Explanation:
The Bureau of Indian Affairs is the answer
Answer: they arrived over a land bridge
Explanation:they follow there food which means there nomadic. so they followed there food to north america
