No matter his first acts in the White House, the raging coronavirus pandemic could take another 100,000 American lives in his first month as president after crossing the grim marker of 400,000 deaths just minutes before Biden began his trip to Washington. He inherits a country weary from 10 months of lockdowns and business closures, divided by attacks on public health professionals and tantalized by the promise of widespread vaccination that will take months to have much effect.