The Mexican Frontier, 1821–1846 published by other historians. This work was supplemented by additional primary materials which he discovered in the archives that allowed him to delve further into certain areas. "The Mexican Frontier" examines the southwestern United States, specifically the areas now known as Arizona, California, New Mexico, and Texas, in the twenty-five years between Mexico's independence from Spain and the beginning of the Mexican–American War. This resulted in the transfer of control of the border areas to the United States. In the early days of the Republic of Mexico, these areas comprised its northern border, including the territories of Alta California and
World War II by country troops from west Africa. Kenyans also served in the Royal Navy and some individuals also served in the Royal Air Force. Korea was under Japanese rule as part of Japan's 50-year imperialist expansion (22 August 1910 ~ 15 August 1945). Formally, Japanese rule ended on 2 September 1945 upon the Japanese defeat in World War II in 1945. Independence movements during the colonial era included the March 1st Movement. Koreans created an official, formal government to prepare for independence. The Provisional Charter of Korea was declared on April 11, 1919, about a month after the March 1st Movement. Two days