(Matthew Brown | AP) In this Oct. 29, 2019, file photo, opponents of the Keystone XL oil pipeline from Canada demonstrate in sub-freezing temperatures in Billings, Mont. Major construction projects moving forward along the U.S. borders with Canada and Mexico amid the coronavirus pandemic are raising fears workers could spread infections within nearby communities, including several Native American tribes. Several of the tribes whose land is skirted by the proposed pipeline route in South Dakota and Montana have enacted stricter measures than the state to protect tribal members from the coronavirus.