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COVID-19 was spreading in the US by December 2019, mounting evidence suggestsThe new findings suggest the virus may have been circulating in Illinois as early as Dec. 24, 2019.
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What was the deadliest day in US history?It's impossible to know for sure the deadliest day in U.S. history because you can end up comparing apples with oranges.
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Inauguration day: Why presidents must wait 2 months to startHere's why inauguration day occurs months after an election.
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UK coronavirus variant could become dominant US strain by March, CDC saysStrict measures will be needed to prevent it from taking over.
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How does impeachment work?Will President Trump be impeached? Here's a look at what impeachment means, how it works and who has been impeached.
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What is a coup?A coup d'état, which translates as "stroke of the state," can be triggered by military actions, the involvement of foreign governments, or popular revolts.
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1st wild animal in US infected with SARS-CoV-2 found in UtahA wild mink just tested positive.
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When will COVID-19 vaccines start to make a difference?A new model projects how case rates, hospitalizations and deaths will fall as COVID-19 vaccinations begin.
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COVID-19 may have arrived in US by December 2019Researchers studied blood samples from December 2019, and found a small number tested positive for antibodies against the virus.
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