That puts its total population of 170,000 in range of the Hwasong-12 intermediate-range ballistic missiles that Kim Jong Un's regime has threatened to fire as a counter-punch to President Donald Trump's warning that the US would respond with "fire and fury" to provocative actions by North Korea. Spain's colonial rule continued until the US took control in 1898 during the Spanish-American War.
The Blue House says the top security advisers of South Korea and the USA discussed the current security situation on the Korean peninsula and in the region, and shared their thoughts on future measures both countries could take to deter threats from North Korea.
Japan lies only about 620 miles to the east of North Korea. In 2013, state media cited Kim Jong-Un as having ordered his military to prepare plans on launching strikes on USA military bases in Guam, Hawaii and South Korea as well as the American mainland. US President Donald Trump tweeted Friday.
Mount suggested an attempt to shoot down the missile might be exactly what Kim Jong Un wants, as missing even one projectile would be an embarrassment for the United States military. About 7,000 USA soldiers and their families live on the island, which has a population of 160,000, according to the Associated Press.
Naval Base Guam is an important outpost for US fast-attack nuclear powered submarines that are a key means for gathering intelligence in the region, including off the Korean peninsula and in the South China Sea where China has been building military bases on man-made islands that have stirred tension across Asia.
The other? "If they attack Guam or some other American interest", Graham said.
Guamanians have served in all major USA wars since World War II and see military service as a source of pride. Residents do not pay USA income taxes or vote in the general election for US president.
"Japan invaded us, the Spanish invaded us", Genereux says.
During the Vietnam War, the Air Force sent 155 B-52 bombers to Guam to hit targets in Southeast Asia.
It was not the first time Guam has been put on notice and similar threats made since 2013 led to the US military permanently deploying a Terminal High Altitude Area Defense (THAAD) interceptor system on the tiny island. Chamorros are the indigenous people of Guam.
But Mount said Pyongyang's threats to launch multiple missiles at Guam could be a deliberate action to call the United States' bluff on missile defense. Its chief languages are English and Chamorro.
The possibility of escalation is made even more acute by the lack of any means of official communication across the Demilitarized Zone, though there has been no easing of the barrage of inflammatory comments in the US and the North since new sanctions against North Korea were announced last week. They are both managed under Joint Base Marianas.
The main beach front was busy with tourists dozing under trees or on the sun loungers of five-star hotels lined up before a calm sea where people in kayaks collided with swan-shaped pedalos and inflatable hoops. An air base with long-range bombers and a naval base that's home port for fast-attack submarines are among the most "strategically important" the USA has in the Pacific, according to the CIA World Factbook.
Guam, an unincorporated US territory, is a strategic outpost about 2,100 miles south-east of Pyongyang.
Guam is home to U.S. Naval Base Guam and the Andersen Air Force Base. It has two 2-mile (3-kilometer) -long runways and large fuel and munitions storage facilities.
Guam Governor Eddie Calvo said the remote Pacific island was accustomed to being a target ever since Washington placed military installations there.
US forces on the island were not immediately available for comment. It did so to compensate for USA forces diverted from other bases in the Asia-Pacific region to fight in the Middle East.
But he said that by using "the same kind of rhetoric that North Korea is long accustomed to using", Mr. Trump also ends up unintentionally helping Mr. Kim's strategy of creating the fear "that he could instigate war".
But even these systems have their limitations and can't guarantee protection from shorter-range ballistic and cruise missiles. If this system fails, three battalions of land-based Patriot missiles will intercept missiles during the terminal phase.