2020 has been defined by the COVID-19 pandemic. A disease that was unknown a year ago has killed more than 1.5 million people and devastated economies worldwide. In October 2019, public health experts ranked the United States at the top of a pandemic preparedness index. Now, the United States leads the world in coronavirus cases and deaths. VOA's Steve Baragona looks back at a year of failures that brought the country to this point.