Uncategorized Pres. Trump declares a national emergency in the US. March 13, 2020 Source: December 24, 2020. Susie Neilson and Aylin Woodward. “A Comprehensive Timeline of the Coronavirus Pandemic at 1 Year, from China’s First Case to the Present.” Business Insider. https://www.businessinsider.com/coronavirus-pandemic-timeline-history-major-events-2020-3.Magazine.