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To find the combined population of the United States and Mexico, you simply need to add their populations together.
Population of United States = 3.1 * 10^8
Population of Mexico = 1.2 * 10^8
Combined population = 3.1 * 10^8 + 1.2 * 10^8 = 4.3 * 10^8
Therefore, the combined population of the United States and Mexico in 2011 was 4.3 * 10^8, which is option D.