Mezue ahịrịokwu na-esonụ: McKinley bụ onyeisi ala n'oge Agha Spen na America nke 1898, bụ́ nke mba United States meriri ngwa ngwa na n'ụzọ doro anya. Dị ka akụkụ nke nkwekọrịta udo ahụ, Spen nyefere United States ógbè ya ndị dị na Puerto Rico, Guam, na Philippines. Ka mba ahụ na-enwe ọganihu, McKinley meriri Bryan ọzọ na ntuli aka onye isi ala nke 1900.
Onye isi ala Leon Czolgosz gburu Onye isi ala McKinley na Septemba 1901, Onye isi ala Theodore Roosevelt nọchiri ya.