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Environmental and conservation organizations in the United States have been formed to help protect the environment, habitats, flora, and fauna on federally owned land, on private land, within coastal limits, in-state conservation areas, in-state parks and in locally governed municipalities.
State agriculture commissioners in the United States (14 C, 10 P) Wine regions of the United States by state or territory (41 C, 31 P) Agriculture in Puerto Rico (6 C, 5 P)
The Development of American Agriculture: A Historical Analysis (1998) Conkin, Paul. A Revolution Down on the Farm: The Transformation of American Agriculture since 1929 (2008) Gardner, Bruce L. (2002). American Agriculture in the Twentieth Century: How It Flourished and What It Cost. Harvard University Press. ISBN 0-674-00748-4. Hurt, R. Douglas.
Conservation agriculture (CA) can be defined by a statement given by the Food and Agriculture Organization of the United Nations as "Conservation Agriculture (CA) is a farming system that can prevent losses of arable land while regenerating degraded lands.It promotes minimum soil disturbance (i.e. no-till farming), maintenance of a permanent soil cover, and diversification of plant species.
Level IV mapping is still underway but is complete across most of the United States. For an example of Level IV data, see List of ecoregions in Oregon and the associated articles. The classification system excludes the U.S. state of Hawaii, which is not part of the North American continent.
The United States of America is a federal republic [1] consisting of 50 states, a federal district (Washington, D.C., the capital city of the United States), five major territories, and various minor islands. [2] [3] Both the states and the United States as a whole are each sovereign jurisdictions. [4]
An example of a keystone species in the North American deserts would be the coyote or mountain lion. These two predators can control the population and distribution of a large number of prey species. A single mountain lion can roam an area of hundreds of kilometers, in which deer, rabbits, and bird species are partly controlled by a predator of ...
Once agriculture became more prevalent and useful, the Pueblos began to group together in larger numbers, forming groups of many connected houses, with basements full of stored food. Between 1000 and 1500 CE, Native American agriculture expanded greatly. Around this time, the Navajos and Apaches became the largest population in the area.