History of immigration to the United States 1850. In 1848, the Treaty of Guadalupe Hidalgo, concluding the Mexican War, extended U.S. citizenship to approximately 60,000 Mexican residents of the New Mexico Territory and 10,000 living in California. An additional approximate 2,500 foreign born California residents also become U.S. citizens. In 1849, the California Gold Rush attracted 100,000 would-be miners from the Eastern U.S., Latin America, China, Australia, and Europe. California became a state in 1850 with a population of about 90,000. Between 1850 and 1930, about 5 million Germans migrated to the United States, peaking between 1881 and 1885 when a million Germans settled primarily in the
Presbyterian Church in the United States of America and presbyteries belonging to the New School withdrew and established the pro-slavery United Synod of the Presbyterian Church. Old School Presbyterians followed in 1861 after the start of hostilities in the American Civil War. In May, the Old School General Assembly passed the controversial Gardiner Spring Resolutions, which called for Presbyterians to support the Constitution and Federal Government of the United States. In response, representatives of Old School presbyteries in the South met in December at Augusta, Georgia, to form the Presbyterian Church in the Confederate States of America. The Presbyterian Church in the CSA absorbed the smaller United Synod