▁kilom eters ▁north ▁of ▁the ▁front ier ▁fort ifications ▁between ▁Chile ▁and ▁the ▁Ara uc an ía , ▁the ▁territory ▁that ▁the ▁Map uche ▁ind igen ous ▁pe op les ▁had ▁successfully ▁retained ▁after ▁defe ating ▁Spain ▁in ▁the ▁Ara u co ▁War . ▁ ▁History ▁ ▁Con quest ▁of ▁the ▁At ac ama ▁▁ ▁To ▁its ▁north , ▁Chile ▁im posed ▁its ▁domin ance ▁by ▁elimin ating ▁the ▁threat ▁pos ed ▁by ▁the ▁union ▁of ▁Boliv ia ▁with ▁Peru ▁during ▁the ▁War ▁of ▁the ▁Confeder ation ▁( 1 8 3 6 - 1 8 3 9 ), ▁followed ▁by ▁the ▁con quest ▁of ▁these ▁countries ' ▁min eral - rich ▁territ ories ▁in ▁the ▁At ac ama ▁during ▁the ▁War ▁of ▁the ▁Pacific ▁( 1 8 7 9 - 1 8 8 4 ) — in ▁the ▁process ▁leaving ▁Boliv ia ▁land locked ▁and ▁s ack ing ▁the ▁Per uv ian ▁capital . ▁▁ ▁Chile ▁slowly ▁started ▁to ▁expand ▁its ▁influence ▁and ▁to ▁establish ▁its ▁borders . ▁By ▁the ▁T ant au co ▁Tre aty , ▁the ▁arch ip el ago ▁of ▁Ch ilo é ▁was ▁incorpor ated ▁in ▁ 1 8 2 6 . ▁The ▁economy ▁began ▁to ▁bo om ▁due ▁to ▁the ▁discovery ▁of ▁silver ▁ore ▁in ▁Ch añ ar cil lo , ▁and ▁the ▁growing ▁trade ▁of ▁the ▁port ▁of ▁Val para í so , ▁which ▁led ▁to ▁conflict ▁over ▁mar itime ▁supre m acy ▁in ▁the ▁Pacific ▁with ▁Peru . ▁▁ ▁The ▁B ound ary ▁treat y ▁of