Answer:
September 11, 2001
Explanation:
The World Trade Center was destroyed following the terrorist attacks of September 11, 2001, when two hijacked commercial planes collided with the Twin Towers.
Nullification is the right answer.
Nullification is a legal provision in the constitution of the U.S, that asserts that a state has the power to nullify, or cancel, any central law which that state has deemed undemocratic with regard to the constitution of the United States. This theory of nullification is based on a belief that as creators of the Federal Government, the states have the ultimate authority to define the limits of the power of that government.
NAFTA stands for The North American Free Trade Agreement. This agreement is a trade agreement between the U.S, Canada, and Mexico. These three countries signed this agreement to join together and have cooperation in trade. If NAFTA were to have issues in the trading policies, that would mean that the U.S and Canada would have heated relations based on trade.