WASHINGTON, March 19—Confidence among U.S. construction industry leaders generally improved in January, consistent with the burgeoning momentum of the U.S. economy during the early weeks of 2020, according to the Associated Builders and Contractors Construction Confidence Index released today. While the reading for sales expectations edged lower for the month, confidence pertaining to sales, profit margins and staffing levels remain well above the threshold of 50, signaling expected growth in those three metrics.