The Buy American Act is a United States federal law that requires the government to purchase goods and services from domestic sources, unless there is a compelling reason to do otherwise. However, Guam is a U.S. territory, not a state, and is therefore not subject to the Buy American Act.
Instead, the government of Guam has its own procurement laws, which are designed to promote fair competition and protect local businesses. These laws do not require the government to purchase goods and services from domestic sources, but they do give preference to local businesses when all other factors are equal.