More than 1 million Americans were without power Sunday afternoon as a historic winter storm barreled across large portions of the U.S. As of 2:35 p.m. ET, Tennessee was the hardest-hit state, with approximately 306,700 customers experiencing outages. Mississippi followed with about 175,300 outages, while Louisiana reported roughly 145,100, according to data from PowerOutage.us.Significant outages were also reported in Texas, where about 93,000 people lost power, as well as Georgia with 80,700, Kentucky with 69,500,…