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Explanation:

Mainland Southeast Asia is drained by five major river systems, which from west to east are the Irrawaddy, Salween, Chao Phraya, Mekong, and Red rivers. The three largest systems—the Irrawaddy, Salween, and Mekong—have their origins in the Plateau of Tibet.

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albany plan of union, 1754. the albany plan of union was a plan to place the british north american colonies under a more centralized government