▁Tw enti eth ▁Century ▁▁ ▁The ▁tw enti eth ▁century ▁saw ▁the ▁continued ▁pla cement ▁of ▁monuments ▁in ▁public ▁spaces ▁of ▁Barcelona , ▁following ▁the ▁custom ▁started ▁with ▁the ▁celebr ation ▁of ▁the ▁Universal ▁Ex hib ition . ▁This ▁was ▁the ▁century ▁that ▁saw ▁the ▁largest ▁number ▁of ▁works ▁placed ▁on ▁the ▁public ▁roads ▁of ▁the ▁city . ▁It ▁is ▁not ew orth y ▁that ▁during ▁the ▁turn ▁of ▁the ▁century ▁the ▁city ▁expanded , ▁incorpor ating ▁several ▁neighbour ing ▁municipal ities ▁that ▁became ▁new ▁districts ▁of ▁Barcelona : ▁S ants - Mont ju ï c , ▁Les ▁Cort s , ▁Sant ▁Ger vas i ▁de ▁Cass oles , ▁Gr à cia , ▁Sant ▁And reu ▁de ▁Pal om ar ▁and ▁Sant ▁Martí ▁de ▁Pro ven ç als ▁in ▁ 1 8 9 7 , ▁H ort a ▁in ▁ 1 9 0 4 ▁and ▁Sar ri à ▁in ▁ 1 9 2 1 . ▁The ▁political ▁situation ▁in ▁the ▁tw enti eth ▁century ▁was ▁tum ult uous , ▁with ▁the ▁end ▁of ▁the ▁mon archy ▁in ▁ 1 9 3 1 ▁and ▁the ▁arrival ▁of ▁the ▁Second ▁Republic , ▁the ▁Civil ▁War ▁and ▁Franco ist ▁Spain , ▁the ▁rest oration ▁of ▁the ▁mon archy ▁and ▁the ▁arrival ▁of ▁dem ocracy . ▁The ▁century ▁saw ▁the ▁infl ux ▁of ▁imm igr ants ▁to ▁the ▁city , ▁with ▁a ▁consequ ent ▁increase ▁in ▁the ▁population : ▁from ▁ 5 3 0 , 0 0 0 ▁in ▁ 1 9 0 0 ▁to ▁ 1