chapter 13 By alexis street 1819 adams-onis treaty 1821 Florida becomes American territory 1825 Russia gives up claim to oregon 1835 whitmans arrive in oregon 1836 Texas declares its independence 1845 Florida and Texas become states 1846 Americans declared California independent 1847 The Mormons finally reached the Great Salt lake 1848 Mexicos leaders signed the treaty of Guadalupe Hidalgo 1849 Beginning of Gold rush 1850 California became a free state 1850 Congress established the Utah Territory