This is apparently a thing he does, and this will be a "walk in the park," so to speak:
In 2019, he became the first and only person to make the 80-mile round-trip hike to Mount Everest Base Camp without shoes. Two years later, he set the 2021 Guinness World Record for the longest barefoot journey after hiking 1,875 miles on the Australian coast. Now he plans to break that record by walking 3,000 miles from Los Angeles to New York City, entirely barefoot.
The problem in the US is not the "barefoot" thing. It's the walking. For many people, someone strange walking in their area is a prime suspect, so this guy better avoids any "stand your ground" states in order not to get shot for walking suspiciously.