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WATCH: 101st Airborne celebrates America's founding

ABC News' Stephanie Ramos is at Fort Campbell Army base, home of the storied 101st Airborne, in Kentucky.

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WATCH: David Muir goes inside the vault holding America's founding documents

In 1776, the Declaration of Independence was signed in Philadelphia. David Muir is in the room where it all happened – and sees the first draft of the U.S. Constitution.

WATCH: How family-run farms helped build the America we know today

Sara Haines returned to her home state of Iowa to examine the rich history of small, family-run farms.

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WATCH: Eagle-eye view of the Great American Fair

ABC News' Chief White House Correspondent Mary Bruce is atop the 110-foot-tall Ferris wheel that is the centerpiece of the Great American Fair.

July Fourth fireworks may bring 'hazardous' air quality to Southern California. What you need to know

Hazardous levels of air pollution are expected across central and southern Los Angeles County, northern Orange County, Riverside and San Bernardino counties from 5 p.m. Saturday evening through 3 p.m. Sunday.