Which of the following are the leading theories that describe how people first arrived in North America? Select the two correct answers. A.
People may have walked over a land bridge from Asia.

B.
People may have traveled over by boat along the Pacific Coast.

C.
People may have sailed across the Atlantic Ocean.

D.
People may have crossed over from South America.

E.
People may have walked across the then-frozen Pacific Ocean

Which of the following answer best explains the ideals or principles led to the concept of manifest destiny? a americans wanted the european countries to stay out of the north american continent. b americans felt they had a god-given duty to protect the land of the native americans. c americans thought they had a god-given duty to spread their culture and government. d americans learned about this concept from the native americans tribes had encountered.