9/11 anniversary raises questions over why US troops stayed in Afghanistan so long.

A five-part docuseries, "9/11 Twenty Years Later: The Longest Shadow," takes a closer look at the wars in Afghanistan and Iraq.

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All-civilian crew completes 1st full day in space

All-civilian crew completes 1st full day in space

The SpaceX Inspiration4 mission is the third recent billionaire-backed space launch -- the first with an all-civilian crew to reach orbit.

Former gymnast calls for systemic change after bungled investigation.

Former gymnast calls for systemic change after bungled investigation.

Rachael Denhollander was the first gymnast to come forward with allegations against Larry Nassar, now she’s demanding accountability.

‘Corazón de América’ examines colorism in the Latin American community.

‘Corazón de América’ examines colorism in the Latin American community.

The “Soul of a Nation” special is celebrating Hispanic Heritage Month by holding conversations about difficult topics.

ABC News Live: SpaceX makes history launching all-civilian crew into orbit.

ABC News Live: SpaceX makes history launching all-civilian crew into orbit.

Plus, what’s next after U.S. gymnasts’ heart-wrenching testimony, and the FDA weighs questions over booster shots. WATCH the ABC News Live Stream Here: SUBSCRIBE to ABC NEWS: Watch More on LIKE ABC News on FACEBOOK FOLLOW ABC News on TWITTER: #ABC...

Broadway returns, protecting the Capitol, saving Sequoia: World in Photos, Sept.

Broadway returns, protecting the Capitol, saving Sequoia: World in Photos, Sept.

A look at the top photos from around the globe.