Eager travelers and their relatives rejoiced, wept and breathed sighs of relief as the United States reopened to vaccinated visitors, ending 20 months of Covid-19 restrictions. From Rainbow Bridge at the US-Canada border to Mexico's Tijuana crossing at San Ysidro, California, cars, motor homes and masked pedestrians clogged entry points for highly anticipated reunions. At airports and other US ports of entry, reunited relatives hugged as many met for the first time since the coronavirus swept the globe. In Europe, passengers lined up excitedly at airports to board planes bound for American cities. A RECAP OF the reopening of US borders