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7984 BCE
Agricultural Revolution
The Agricultural Revolution was a period of technological improvement and increased crop productivity that occurred during the 18th and early 19th centuries in Europe. In this lesson, learn the timeline, causes, effects and major inventions that spurred this shift in production. -
Industrial Revolution
The Industrial Revolution was the transition to new manufacturing processes in the period from about 1760 to sometime between 1820 and 1840. -
John Muir
John Muir (1838-1914) was America's most famous and influential naturalist and conservationist. He is one of California's most important historical personalities. He has been called "The Father of our National Parks," "Wilderness Prophet," and "Citizen of the Universe." -
Walden by Henry David Thoreau
Walden is a book by noted transcendentalist Henry David Thoreau. The text is a reflection upon simple living in natural surroundings. -
Homestead Act
Signed into law by President Abraham Lincoln on May 20, 1862, the Homestead Act encouraged Western migration by providing settlers 160 acres of public land. In exchange, homesteaders paid a small filing fee and were required to complete five years of continuous residence before receiving ownership of the land. -
Yellowstone National Park founded
Yellowstone National Park is a national park located primarily in the U.S. state of Wyoming, although it also extends into Montana and Idaho. It was established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872. -
American Forestry Association founded
American Forests is a 501 non-profit conservation organization, established in 1875, and dedicated to protecting and restoring healthy forest ecosystems. The current headquarters are in Washington, D.C. -
Yosemite plus Sequoia National Park founded
Muir and Johnson lobbied Congress for the Act that created Yosemite National Park on October 1, 1890. The State of California, however, retained control of Yosemite Valley and Mariposa Grove. Muir also helped persuade local officials to virtually eliminate grazing from the Yosemite high country. -
General Revision Act
The General Revision Act of 1891 was a Federal legislation initiative signed in 1891 under the Presidential Administration of Benjamin Harrison. -
Sierra Club founded
The Sierra Club is an environmental organization in the United States. It was founded on May 28, 1892, in San Francisco, California, by the Scottish-American preservationist John Muir, who became its first president.