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
History of the Philippines (1521–1898) of Paris (1898) was signed, ending the Spanish–American War and selling the Philippines to the United States for $20 million. With this treaty, Spanish rule in the Philippines formally ended. On January 23, 1899, Aguinaldo established the First Philippine Republic in Malolos. On February 4, 1899, the Philippine–American War began with the Battle of Manila (1899) between Americans forces and the nascent Philippine Republic. History of the Philippines (1521–1898) The history of the Philippines from 1521 to 1898, also known as the Spanish colonial period, a period that spans during the Captaincy General of the Philippines located in the collection