Some environmental issues in North America are global warning and oil spill.
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There are four political entities in North America. The four political entities are Canada, France, United States, and, of course, Mexico.
democracy
Capitalism
America has always had political allies; even at the time of the Revolutionary War, the rebellious colonies were aided by France. America is currently part of a formal alliance called NATO (the North Atlantic Treaty Organization) and America's NATO allies are helping America in its current war in Afghanistan. I really do not know what could have given you the idea that America should not have political allies. Allies are helpful.
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it is south america
There isn't really a "main political" land. All of the countries are political to some extent, in North, Central, or South America.
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There is no 'New America'. Perhaps you mean North America, which is one of the 7 political continents?