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In page Greater Los Angeles:

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The explosive growth of the region in the 20th century can be attributed to its favorable Mediterranean climate, the availability of land and many booming industries such as oil, automobile and rubber, motion pictures, intermodal, logistics, and aerospace which in turn attracted millions of people from all over the United States and world.[citation needed] Citrus production was important to the region's development in the earlier part of the 20th century.[4]