How climate change and forest management make wildfires harder to contain.

Wildfires in California, Oregon and Washington are some of the biggest on record, and experts said a combination of factors could continue to make them more frequent.

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COVID-19 vaccine supplies dwindle as Biden takes control.

COVID-19 vaccine supplies dwindle as Biden takes control.

The new administration began on the deadliest day of the pandemic thus far with more than 4,400 lives lost in the U.S. in just 24 hours.

Jill Biden makes history as 1st first lady to hold full-time job.

Jill Biden makes history as 1st first lady to hold full-time job.

ABC News’ senior White House correspondent Mary Bruce shares what to know about the new first family occupying the White House.

Biden becomes 46th president of US in historic inauguration.

Biden becomes 46th president of US in historic inauguration.

Joe Biden was sworn in minutes after Kamala Harris became the first female, Black and South Asian vice president in a ceremony marked by messages of hope and healing and star performances.

Presidential historian: 'We’ve rarely seen America so fractured'.

Presidential historian: 'We’ve rarely seen America so fractured'.

Historian Mark Updegrove speaks about the importance of seeing outgoing and incoming presidents together on Inauguration Day and the challenge of uniting the country.

President Biden signs flurry of executive orders on 1st day.

President Biden signs flurry of executive orders on 1st day.

On his first day, President Joe Biden signed multiple executive orders, including rejoining the Paris Climate agreement, and reversing former President Donald Trump’s travel ban.