Final answer:
The demographics of America have changed over time, with a shift towards an urban population and changes in the racial composition. Immigration patterns have also contributed to these changes.
Step-by-step explanation:
The demographics of America have undergone significant changes over the past century. One major change is the shift towards an urban population, with the percentage of people living in urban areas increasing from 40% to 80%. Another change is the racial composition, with the white population decreasing from 89% to 83%, while the African American population has remained relatively stable at 12%-13%. Immigration patterns have also changed, with a decline in European immigration and an increase in immigration from Asia and Latin America.