Although Portland's population increased by 38% between 1980 and 2011,its urban area expanded by only 2%.This illustrates the use of ____.

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Urban growth boundaries are limits set by the government on the amount of suburban or rural land that can be developed for urban use. This enables a city to control its urban sprawl, while also preserving farmland, natural habitats, and rural lifestyles. Portland has been recognized for its successful use of urban growth boundaries, which have helped to prevent excessive urbanization and preserve the city's livability.

Although Portland's Population Increased by 38% Between 1980 and 2011,its