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The United States of America is a North American nation that is the world's most dominant economic and military power. Likewise, its cultural imprint spans the world, led in large part by its popular culture expressed in music, movies and television.
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More of the world's population is now concentrated in heavily populated urban areas known as <u>megalopolis</u>. This is quite a contrast from the past, when <u>indigenous</u> or native groups were either farmers or <u>nomads</u>— hunters and gatherers who moved between places in search of food. Advanced technology has led to <u>globalization</u>, the integration of world economics and cultures, in the world's more developed countries. This integration requires increased <u>conservation</u>, the responsible use and management of natural resources.
