It is about 2,200 miles (3,500 km) southeast of North Korea, much closer than it is to any of the United States.
The commander of the North Korean army made more threats Wednesday night, saing they will have a plan to fire on Guam by the middle of this month. The Dow Jones industrial average fell 0.17 percent, with the tech-heavy Nasdaq composite index declining 0.28 percent.
"North Korea has a good fight on their hands if they're going to try to mess with Guam", said resident Andrea Salas.
An attack on Guam will be considered an attack on the United States, Guam's governor warned in response to a threat that North Korea would create an "enveloping fire" around the USA territory.
Most large-cap stocks were mixed across the board. We're going to keep Guam safe. "It's pretty insane - and I don't know I've been looking at the people here acting like it's not a problem, but I think it's a really big problem for us", said resident Victor Bilon. While there has been some resistance and displeasure from the people of Guam over the USA military's presence, it is also essential to the island's economy, second only to tourism in importance. About 6,000 United States marines are stationed in Guam, and there are plans to send thousands more.
Guam is protected by the advanced US Terminal High Altitude Area Defense (THAAD) anti-missile system.
"We're very concerned about the news but we've been given assurance by the local government primarily through Governor Eddie Calvo that he is working with the military to ensure that the safety of all the residents are the utmost priority", said Norman Analista, president of the Filipino Community of Guam.
He told CNN that while there was some fear, people were used to living with North Korean posturing. Alexandra Harvey added, "My husband's military, so from the military side of it, I think if it was really imminent they would have let us know".
Last week, Graham said "If there's going to be a war to stop them, it will be over there".
"You're also talking over 200,000 American citizens, civilians, that will be caught in the crosshairs".