"The westward tide rolled on, bearing with it new problems of adjustment. The generation of the 1840’s saw their culmination. During these years there took place the annexation of Texas, a war with Mexico, the conquest of California, and the settlement of the Oregon boundary with Great Britain. Adventurous Americans in search of land and riches had been since 1820 crossing the Mexican boundary into the Texas country, which belonged to the Republic of Mexico, freed from Spain - in 1821. While this community was growing, American sailors on the Pacific coast, captains interested in the China trade, established themselves in the ports of the Mexican Province of California. Pioneers pushed their way overland in search of skins and furs, and by 1826 reached the mission stations of the Province. The Mexicans, alarmed at the appearance of these settlers, vainly sought to stem the flood; for Mexican Governments were highly unstable, and in distant Provinces their writ hardly ran. But there appeared on the scene a new military dictator, Santa Anna, determined to strengthen Mexican authority, and at once a revolt broke out."