Here's why:
* Guam is a US territory. It was a Spanish colony for over 300 years, but the US took control in 1898.
* The dominant language in Guam is Chamorro. This is the native language of the indigenous Chamorro people.
* English is the official language of Guam. It is widely spoken and used in government, education, and commerce.
While some older residents may have some knowledge of Spanish due to the colonial past, it is not a widely spoken language in Guam today.