WISCONSIN, the thirtieth State, was admitted to the Union May 29, 1848. Its name is derived from its principal river, and signifies "The gathering of the waters." It was explored by French missionaries and traders as early as 1639. Green Bay was founded in 1745. This region was also a part of the Northwestern Territory. It was comprised in the Territory of Illinois, then of Michigan, and in 1836 became a separate Territory. CALIFORNIA, the thirty-first State, was admitted to the Union September 9, 1850 (see p. 190). Sir Francis Drake, in 1579, sailed along its coast, naming it New Albion, and visited San Francisco harbor (see p. 35). In 1769, the Spaniards established the mission of San Diego (de-a'-go), and in 1776 (the year of the Declaration of Independence), one at San Francisco. [Footnote: In 1835, a shanty owned by one Richardson was the only human habitation and the vast bay was a solitude The first survey of streets and town lots was in 1839 The principal trade was in exporting hides and that was small. In 1846 an American man of war entered the harbor and took possession in the name of the United States. The town was known as Yerba Buena (good herb) until 1847 when it was changed to its present name. About that time it had a population of four hundred and fifty nine. The discovery of gold in 1848 gave the city its first start toward its present distinction. Within eighteen months following December 1849, the city lost by fire $16,000,000 of property though its population did not exceed thirty thousand. Such however, was the enterprise of its citizens that these tremendous losses scarcely interrupted its growth or prosperity. Its magnificent harbor and its railroad communications give it an extensive commerce on the Pacific Coast.] [Illustration: SAN FRANCISCO BAY PACIFIC OCEAN, THE GOLDEN GATE. BIRD'S EYE VIEW OF SAN FRANCISCO] In 1803, they had eighteen missions with over fifteen thousand converts, and the entire government of the country was in the hands of the Franciscan monks. The Mexican revolution, in 1822, overthrew the Spanish power in California, and in a few years the Franciscans were stripped of their wealth and influence. In 1831, the white population did not exceed five thousand. From 1843 to 1846, many emigrants from the United States settled in California, and, under the leadership of Fremont and others, wrested the country from Mexico (see p. 188). By the treaty at the close of the Mexican war, Upper California was ceded to the United States. It embraced about 450,000 square miles, comprising what is now known as California, Nevada, Arizona, Utah, and parts of Colorado and New Mexico. (Maps of IVth and VIth Epochs.)