The number of new Covid-19 cases in the United States seems to have peaked, with cases in states hit hard by the delta variant earlier edging downward over the last week, according to an analysis by NBC News. It’s the longest sustained decline in cases in nearly three months, giving hope to some leading pandemic forecasters. Some hospitals in areas of the country with low vaccination rates are still in crisis mode, but overall the hospitalization rate in the U.S. has dropped…