Exposed them to new lands to conquer as well as spread influence too. It allowed competing countries to appear superior if they conquered land in the land. Land=resources and power all equate to more economic oppurtunities
The Second Law of Motion describes what happens to a massive body when it is acted upon by an external force. ... The Third Law of Motion states, "For every action, there is an equal and opposite reaction." This law describes what happens to a body when it exerts a force on another body.
Yes, at least, the colonists considered it so. It made it very difficult and expensive for all colonists to get goods.
Manifest destiny was the reason the US claimed Oregon country.