Tuhia he haere tonu mo tenei irava - I te tuatahi i whakahe te nekehanga e te Perehitini Woodrow Wilson, i whakapono ko te United States me noho i roto i te tuunga tuuturu kia taea ai te whakatau i te rangimarie i Uropi. He maha nga whakahaere i hangaia huri noa i te Movement Preparedness Movement me te whakahaere i nga huihuinga me te whakahaere i te whakahee ki nga kaupapa a Wilson. Whai muri i te whakangaromanga o te "Lusitania" e ngā kaipuke U Tiamana i te 7 o Mei, 1915, ka whakarewahia e Pancho Villa tana whakaekenga
I te tukinga ki Columbus, New Mexico, ka huri te whakaaro o Wilson. I whakaaetia e te Kaunihera te Ture Tiaki Whenua o te tau 1916 i te Hune 1916 hei whakamana i te pikinga o te rahi o te ope taua o Amerika mai i te 100,000 tangata i te tau 1916 ki te 200,000 i runga i te mahi kaha me te 400,000 i te US National Guard, i te 1921. I whakapakarihia hoki e ia he nui o te whakatipu mo te wa roa i te US Navy.