 Complete the following phrase:  The Chamoru people settled the island approximately 3,500 years ago. Portuguese explorer Ferdid Magellan, while in the service of Spain, was the first European to visit the island on March 6, 1521. Guam was colonized by Spain in 1668. Between the 16th and 18th centuries, Guam was an important stopover for the Spanish Manila Galleons. During the SpanishAmerican War, the United States 