He was first appointed as Justice of the Peace in 1894 by the Spanish government of Guam.
After the capture of Guam by the United States during the Spanish–American War, he retained his role as a judge, sometimes unofficially.
(In 1910, the United States Navy took control of the Guam courts system over an issue of intermarriage.)
In 1915, the United States restored the local judiciary and Cruz Pérez was appointed as an Associate Justice in an earlier Supreme Court of Guam, not related to the present Supreme Court.
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