WHO Declares COVID-19 Pandemic; Trump Declares Emergency

The WHO declares COVID-19 a global pandemic. Trump declares a national emergency March 13, releasing $50 billion in federal aid. Trump initially downplays the threat ('under control', 'hoax', 15 cases going to zero), then restricts travel from Europe. The pandemic dominates the final year of his first term. Operation Warp Speed is launched in May 2020, producing authorized vaccines by December.