Which statements best explain why the Lewis and Clark expedition was a success? ​
Select the three correct answers.
A The expedition established claims of the United States over those of Spain.

B Native American tribes were easily conquered with superior weapons.

C Native Americans agreed to defend territory for the United States.

D Native Americans interacted and cooperated with the explorers.

E The explorers made observations about new plants and animals.

F The explorers identified areas that settlers would consider attractive.

G The expedition found the best seaports in the western United States.