They are at the top because they are the wealthiest and have to most authority
In the city of Philadelphia, Pennsylvania.
Answer:
North American Free Trade Agreement (NAFTA) established a free-trade zone in North America; it was signed in 1992 by Canada, Mexico, and the United States and took effect on Jan. 1, 1994. NAFTA immediately lifted tariffs on the majority of goods produced by the signatory nations.
Explanation:
