The document discusses three major demographic trends that will impact the United States population over the coming decades: 1) An aging population, as the large Baby Boomer generation moves into retirement, will strain social security and health care systems; 2) Immigration and racial/ethnic diversity will continue to increase, altering the population mix; 3) Rapid urbanization will concentrate more of the population in cities and exacerbate social problems in those areas, increasing justice system costs. These trends will present significant economic and social challenges for American society.