WASHINGTON - The NAFTA negotiations could continue for a while, with U.S. trade czar Robert Lighthizer signalling he wants significant changes in multiple areas and isn't interested in a quick, limited deal. Here are some key flashpoints involving Canada: ?Autos: This is the sticking point countries have spent the most effort trying to solve. The U.S. wants to stem the loss of manufacturing jobs to Mexico. Canada broadly shares that goal. However, ...