The current population pyramid of the United States has a noticeable bulge in the middle, which is due primarily to:

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    increased immigration
    better health care
    more accurate census data
    the so-called baby boom
asked Jul 2, 2012 in Geography by anonymous
    

1 Answer

0 votes
the so-called baby boom
answered Jul 5, 2012 by Geodude ~Top Expert~ (9,680 points)



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