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
United Presbyterian Church in the United States of America of a reunion of two long-separated branches of the larger Presbyterian family deriving from the British Isles. Between 1937 and 1955, both the Presbyterian Church in the United States of America, and the United Presbyterian Church of North America had been looking to merge with Reformed Churches. The PCUSA had discussed a merger with the Presbyterian Church in the United States (PCUS), as well as with the Episcopal Church. Both denominations had also been in contact with the Reformed Church in America, as well as the Associate Reformed Presbyterian Church. By the time of the merger, the PCUSA had churches