Roughly One-Third of U.S. Population Had COVID-19 by the End of 2020, New Study August 30, 2021August 29, 2021 Arizona Sun Times Staff – – – Photo “Masked protesters” by Ben Tavener. CC BY 2.0. Sign up here to get your copy of The Arizona Sun Times Daily UpdateDaily updates, breaking news, special offers, and more CONFIRM Thank you for signing up!