Examine the decades 1970, 1990, and 2010 in this population pyramid for the United States. Consider any significant shapes. In particular, note the large bulge that travels upward through the pyramid over time. This bulge represents the baby boomer generation, a generation of Americans who were born in the United States immediately following World War II (1939–1944). How do you think this generation has impacted the U. S. economy through the years? How might it impact the U. S. economy and politics in the future?