The United States of America, also known as the United States, the U.S., the U.S.A., the U.S. of A, the States, and America, is a country in North America. A federal republic, the United States shares land borders with Canada and Mexico, and extends from the Atlantic Ocean to the Pacific Ocean. Its capital is Washington, D.C.
The present-day continental United States has been inhabited for at least 15,000 years by Native Americans. After 16th-century European exploration and settlement, the English established new colonies, and gained control of others, in the eastern portion of the continent in the 17th and early 18th centuries. On 4 July 1776, at war with Britain over fair governance, thirteen of these colonies declared their independence; in 1783, the war ended in British acceptance of the new nation. Since then, the country has more than quadrupled in size: it now consists of 50 states, one federal district, and a number of overseas territories.
At over 3.7 million square miles (over 9.1 million km²), the U.S. is the third largest country by area. It is also the world's third most populous nation, with nearly 300 million people.
More on [ United States ]

Arthur Carhart National Wilderness Training Center - US Federal Government inter-agency training center devoted to training federal and state land managers who have wilderness management responsibilities; They have also developed school curricula on wilderness for primary and secondary education levels.
Meta Description: [ Home Page for the Arthur Carhart National Wilderness Training Center ]
California Biodiversity Council - Formed in 1991 to improve coordination and cooperation between the various resource management and environmental protection organizations at federal, state, and local levels.
Meta Description: [ The California Biodiversity Council was formed in 1991 to improve coordination and cooperation between the various resource management and environmental protection organizations at federal, state, and local levels. ]
Chesapeake Bay Commission - A legislative commission advancing the restoration of Chesapeake Bay.
Meta Description: [ Chesapeake Bay Commission, Chesapeake Bay, Bay Preservation, Blue Crab, Bay Conservation. ]
Chesapeake Bay Program - The regional partnership that's been leading and directing the restoration of the Chesapeake Bay since 1983.
Meta Description: [ Chesapeake Bay Program - Information, data, maps, and publications about the Chesapeake
Bay, the Chesapeake Bay Ecosystem, and the Chesapeake Bay Program. ]
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Council of Great Lakes Governors - The Great Lakes Governors share a dual stewardship for both the world's single largest source of fresh water and the industrial heartland of North America. Today, the Council Governors lead the nation in advancing strategic alliances that stress continued protection of their natural resources and a sustainable world-class regional economy.
DENIX on the Web - U.S. Defense Department Environmental Network Information eXchange. News and information about DOE environmental programs and opportunities.
DOE Environmental Sciences Division Office of Biological and Environmental Research - supports basic research in two general program areas: Environmental Processes: Global Change Research and Environmental Remediation Research
Ecological Exposure Research Division - EPA division develops suites of biological indicators to describe the condition of watershed ecosystems.
Environmental and Societal Impacts Group - National Center for Atmospheric Research studies the interactions between climate, weather, and human activities.
Meta Description: [ The National Center for Atmospheric Research (NCAR) ]
FHWA Office of Environment and Planning - Federal Highway Administration site includes information and links on transportation planning, air quality, water resources, traffic noise, and other environmental topics.
Gulf of Mexico Program - To facilitate the protection and restoration of the coastal marine water and its coastal natural habitats; to sustain living resources; to protect human health and the food supply; and to ensure the recreational use of Gulf shores.
Meta Description: [ Gulf of Mexico Program at U.S. Environmental Protection Agency, Region 4 ]
Interagency Working Group on Sustainable Development Indicators - Established with a mandate to develop recommendations on steps the United States could take to realize sustainable development.
Kentucky Pollution Prevention Center (KPPC) - Provides free environmental help to KY companies. Services include site assessments, a newsletter and a waste exchange.
Mojave Data Ecosystem Program - A wide variety of data and geographical information for mapping the Mojave Desert Ecosystem.
Meta Description: [ A wide variety of data and geographical information for mapping the Mojave Desert Ecosystem ]
National Institute of Environmental Health Sciences - conducts basic research on environmental health and environment-related diseases. Links to information on programs, grants, research, events, contracts, employment, training, outreach events, public information.
Meta Description: [ Home Page of NIEHS, the National Institute of Environmental Health Sciences, which conducts basic research on environmental health and environment-related diseases. Links to information on programs, grants, research, events, contracts, employment, training, outreach events, public information. ]
National Research Council (NRC) Committee on Grand Challenges in Environmental Sciences - Invites the submission of ideas from the scientific community to describe a few grand challenges that appear to have the greatest scientific importance, research potential and practical value.
National Research Council Division on Earth and Life Studies - Provides scientific and technological advice to the U.S. government on a variety of public policy issues, such as pollution control, management of radioactive and toxic wastes, natural disaster mitigation, protection of water and other natural resources, exploration of Earth's resources, and global change.
President's Council on Environmental Quality - News, accomplishments and information about the National Environmental Policy Act (NEPA).
Meta Description: [ Entry point to the Council on Environmental Quality, which coordinates federal environmental efforts and works closely with agencies and other White House offices in the development of environmental policies and initiatives. ]
Resources Agency of California, Office of the Secretary - The mission of the California Resources Agency is to oversee the State's activities relating to the conservation, management, and enhancement of California's natural and cultural resources.
Rhode Island Sea Grant College Program - Conducts research, training, and public outreach on priority issues of importance to the marine environment.
South Florida Ecosystem Program - Topics include mercury contamination, hydrology, coastal wetlands, and remote sensing.
Meta Description: [ The SOFIA website provides scientific information for the south Florida region. ]
Southern Appalachian Man and the Biosphere (SAMAB) - The Southern Appalachian Man and the Biosphere Program (SAMAB) is a consortium of Federal and State Agencies established by an inter-agency agreement to promote the enhancement of environmental health, economic use, and cultural values across the Southern Appalachians.
Meta Description: [ Title page for SAMAB ]
Southern California Coastal Water Research Project - A joint powers agency focusing on marine environmental research.
STAPPA/ALAPCO: State/Local Air Pollution Control Agencies -
Strategic Environmental Research and Development Program (SERDP) - Interagency organization identifies, develops, and transitions environmental technologies that relate directly to defense mission accomplishment.
Meta Description: [ SERDP - Strategic Environmental Research and Development Program ]
U.S. Air Force Center for Environmental Excellence (AFCEE) - A field operating agency of The Civil Engineer of the Air Force. Services and products in environmental restoration, environmental quality, design and construction, public affairs, conservation and environmental planning, and related areas.
Meta Description: [ AFCEE - The Air Force Center for Engineering and the Environment provides Air Force leaders with the comprehensive expertise and professional services necessary to protect, preserve, restore, develop and sustain the nation's environmental and installation resources. ]
U.S. Army Environmental Center - Department of the Army located on the Aberdeen Proving Ground, dedicated to conserving and restoring the land we defend.
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U.S. Government Environmental Agencies - A directory of environmental government agencies at the state and federal levels.
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