By how much did merchandise exports from the U.S. to NAFTA partners increase from 1993 to 2000? By how much did merchandise exports from the U.S. to the world as a whole increase during the same time period? Does this finding suggest that the effect of borders can be reduced through free trade agreements? 

In the period 2001 to 2016, did exports to NAFTA partners grow faster than exports to all countries? Is this what we would expect? Do you think NAFTA had a similar impact on Canada and Mexico? https://legacy.trade.gov/mas/ian/tradeagreements/fta/tg_ian_002425.asp (use this site)