- 
  
  When humans switched to farming instead of hunting and gathering
- 
  
  Machines were built to do work instead of doing things by hand
- 
  
  John Muir also known as "John of the Mountains", was a Scottish-American naturalist, author, environmental philosopher and early advocate of preservation of wilderness in the United States.
- 
  
  Walden is a book by noted transcendentalist Henry David Thoreau. The text is a reflection upon simple living in natural surroundings.
- 
  
  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.
- 
  
  
- 
  
  American Forests is a non-profit conservation organization dedicated to protecting and restoring healthy forest ecosystems.
- 
  
  
- 
  
  It was a Federal legislation initiative signed under the Presidential Administration of Benjamin Harrison.
- 
  
  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
- 
  
  United States law that bans trafficking in illegal wildlife.
- 
  
  Theodore Roosevelt
- 
  
  
- 
  
  The United States Forest Service is an agency of the U.S. Department of Agriculture that administers the nation's 154 national forests and 20 national grasslands, which encompass 193 million acres.
- 
  
  Pinchot is known for reforming the management and development of forests in the United States and for advocating the conservation of the nation's reserves by planned use and renewal.
- 
  
  Wrote "A Sand County Almanac"
- 
  
  a group whose mission was to protect the environment with a focus on birds
- 
  
  Gives the president power to protect land, particularly in the west.
- 
  
  
- 
  
  
- 
  
  
- 
  
  
- 
  
  Focused on agricultural and worked to help farmers, began after Dust Bowl devastation
- 
  
  Made to stop destruction of grazing lands and help livestock
- 
  
  Allowed people to hunt birds
- 
  
  Protected wildlife and seafaring animals
- 
  
  
- 
  
  Persuading the public to take action in conservation
- 
  
  Defined what qualified as wilderness
- 
  
  Introduced "Tragedy of The Commons"
- 
  
  Suggested that people take care of waterways from urbanization
- 
  
  
- 
  
  
- 
  
  
-