c , ▁P ago , ▁and ▁F ena . ▁During ▁this ▁historical ▁period , ▁Spanish ▁language ▁and ▁custom s ▁were ▁introduced ▁in ▁the ▁island ▁and ▁Catholic ism ▁became ▁the ▁pre domin ant ▁religion . ▁The ▁Spanish ▁built ▁infrastr uct ures ▁such ▁as ▁roads ▁and ▁ports , ▁as ▁well ▁as ▁schools ▁and ▁hosp it als . ▁Spanish ▁and ▁Filip inos , ▁mostly ▁men , ▁increasing ly ▁inter mar ried ▁with ▁the ▁Cham or ros , ▁particularly ▁the ▁new ▁cult ured ▁or ▁" high " ▁people ▁( man ak ' k ilo ) ▁or ▁gent ry ▁of ▁the ▁towns . ▁In ▁ 1 7 4 0 , ▁Cham or ros ▁of ▁the ▁Northern ▁Mar iana ▁Islands , ▁except ▁R ota , ▁were ▁moved ▁from ▁some ▁of ▁their ▁home ▁islands ▁to ▁Gu am . ▁Document s ▁from ▁the ▁Spanish ▁period ▁are ▁the ▁only ▁historical ▁sources ▁about ▁colonial ▁and ▁pre - colon ial ▁times ▁in ▁the ▁island . ▁As ▁in ▁the ▁Philippines , ▁Spanish ▁sch ol ars ▁wrote ▁about ▁Cham or ro ▁culture ▁and ▁language , ▁including ▁diction aries ▁and ▁anth rop ological ▁reports ▁which ▁are ▁of ▁great ▁historical ▁value ▁today . ▁ ▁The ▁G alle on ▁Era ▁ended ▁in ▁ 1 8 1 5 ▁following ▁the ▁Mexican ▁Independ ence . ▁Gu am ▁later ▁was ▁host ▁to ▁a ▁number ▁of ▁scient ists , ▁voy agers , ▁and ▁wh al ers ▁from ▁Russia , ▁France , ▁and ▁England ▁who ▁also ▁provided ▁detailed ▁accounts ▁of ▁the ▁daily ▁life ▁on ▁Gu am ▁under ▁Spanish ▁rule . ▁Through ▁the ▁Spanish ▁colonial