A cikin 1918, Shugaba Woodrow Wilson ya ayyana Katmai National Monument a Alaska, wanda ya ƙunshi fiye da 1,000,000 acres (4,000 km2). Katmai daga baya ya fadada zuwa kusan 2,800,000 acres (11,000 km2) ta hanyar sanarwar Antiquities Act na gaba kuma shekaru da yawa shine mafi girman tsarin shakatawa na kasa. Petrified Forest, Grand Canyon, da Great Sand Dunes an kuma ayyana su a matsayin wuraren tarihi na kasa kuma daga baya aka sanya su a matsayin wuraren shakatawa na kasa.Dangane da sanarwar Roosevelt na Grand Canyon, wani mai da'awar hakar ma'adinai ya yi kara a kotun tarayya, yana da'awar cewa Roosevelt ya wuce ikon Dokar Antiquities ta hanyar kare dukkan wani kogi.
Woodrow Wilson