During the colonial era, a major effect of the Appalachian Mountains on settlement was that the mountain range encouraged people to move north. kept people from settling farther east. encouraged expansion and settlement. kept people from settling farther west.

The correct answer is D. Kept people from settling farther west

Explanation:

In the United States, the Appalachian Mountains extend from the North of Maine to Alabama; this geographical feature creates a natural barrier that separates the East coast from western territories. Indeed, during the first decades of colonization, settlers only settled east to the Appalachian and in this territory, the first thirteen colonies were formed. This is because it was challenging to cross the Appalachian Mountains and settled in western territories. This means, these mountains initially prevented settlers from going farther west (option D.)

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.

the secretary of state, appointed by the president with the advice and consent of the senate, is the president's chief foreign affairs adviser. the secretary carries out the president's foreign policies through the state department and the foreign service of the united states.