The North American Free Trade Agreement (NAFTA) went into effect on January 1, 1994. This agreement removed most barriers to trade and investment among the United States, Canada, and Mexico. This agreement is an example of how the United States takes part in a - a. regulatory organization

b. military treaty

c. global economy

d. one world power

Ahistorian has discovered a letter written by an early roman emperor. she translates the letter and discovers that it contains orders to a general before a battle. she works to determine when the letter was written to figure out which battle the letter references.the historian in the passage is most clearly demonstrating which historical thinking skill? a. identifying causes and historical contextb. thinking chronologicallyc. making and evaluating arguments and interpretationsd. analyzing historical sources