Tariff tensions shadow US, Canada, Mexico trade pact signing
By Catherine Lucey & Zeke Miller
'Battle' over as Trudeau, Trump, Pena Nieto sign 'new NAFTA'
By Janyce Mcgregor
Who Started NAFTA and Why? What to Know as Trump Moves On
By Olivia B. Waxman
NAFTA 2.0 is signed — but it's far from finished
By Doug Palmer & Megan Cassella