y all immigrants. In response to pressure from California, Congress had passed an exclusion act in 1879, but it had been vetoed by President Hayes on the ground that it abrogated rights guaranteed to the Chinese by the Burlingame Treaty of 1868. In 1880 these treaty provisions were revised to permit the United States to suspend the immigration of Chinese. The Chinese Exclusion Act was renewed in 1892 for another 10-year period, and in 1902 the suspension of Chinese immigration was made indefinite.Westward migrationThe United States completed its North American expansion in 1867, when Secretary of State Seward persuaded Congress to purchase Alaska from Russia for $7,200,000. Thereafter, the development of the West progressed rapidly, with the percentage of American citizens living west of the Mississippi increasing from about 22 percent in 1880 to 27 percent in 1900. New states were added to the Union throughout the century, and by 1900 there were only three territories still awaiting statehood in the continental United States: Oklahoma, Arizona, and New Mexico.Urban growthIn 1890 the Bureau of the Census discovered that a continuous line could no longer be drawn across the West to define the farthest advance of settlement. Despite the continuing westward movement of population, the frontier had become a symbol of the past. The movement of people from farms to cities more accurately predicted the trends of the future. In 1880 about 28 percent of the American people lived in communities designated by the Bureau of the Census as urban; by 1900 that figure had risen to 40 percent. In those statistics could be read the beginning of the decline of rural power in America and the emergence of a society built upon a burgeon in industrial complex.(See urbanization.) The WestAbraham Lincoln once described the West as the "treasure house of the nation." In the 30 years after the discovery of gold in California, prospectors found gold or silver in e...
