Soon after 9 p.m., about 12 hours after we entered Mexico, we walked into the immigration checkpoint that separates Nogales in Arizona from Nogales in Sonora. One passport scanner didn’t work, but at that hour the foot traffic was light and the line thin. The passage to the United States took five minutes. Less than two hours later, via Interstate 19, we could be in Tucson. 1 Column Content Background Color White Ali...