Which event did emerson call "the shot heard round the world"? a. the shots fired at the boston massacre b. the first shot fired at lexington c. the last shot fired at yorktown d. the first british cannon fire at bunker hill

B

Explanation:

nafta and the union are used as a trade between other countries these   organizations are used as spokes person for the country

interdependence is when all participating groups and individuals depend on each other. if you depend on one anothers goods, you end up trading in order to get the items you're looking for. (for ex: if i have food and you have water, we trade in order to depend on each other to live)