I think it's an excellent point.
For the United States and Canada it's so obvious. We all know NAFTA families. In fact, my middle name is from a French-Canadian ancestor, so it's very common.
Perhaps a better example right now is to think about Mexico's progress in recent decades. I was a student in Mexico in the 1980s. Young people today wouldn't remember this but the United States, let alone Canada, was a very distant place for Mexico at that time. There was a single McDonald's in Mexico City. Middle-class families would take their children there on the weekend and it was a very exotic thing. English wasn't spoken anywhere and America seemed so far away. If you think about the journey Mexico has taken since then, Mexico joined the GATT in 1986. It wasn't even a member of the GATT; it had very high trade barriers. A few years later with NAFTA Mexico made a transition to democracy. Mexico today has a much more robust middle class and has become a major player in the world economy. Mexico back then used to export oil and today Mexico exports manufactured goods. It has much more sustainable economic prospects.
Yes, trade makes big changes in society, doesn't it?