WBEZ brings you fact-based news and information. Sign up for our newsletters to stay up to date on the stories that matter.Canadian Prime Minister Stephen Harper and President Barack Obama will be heading to Mexico this week. They’re scheduled to meet with Mexican President Enrique Peña Nieto for the North American Leaders’ Summit, which comes off the 20th anniversary of the NAFTA, the North American Free Trade Agreement. Christopher Wilson, an associate at the Mexico Institute at the Wilson Center in Washington D.C. He joins us for a primer on the state of economic relations between the three countries.