The biggest misconception is that immigration is the major force behind the country's racial diversity.
"If immigration stopped today, we would still see substantial gains in our minority populations for decades to come. Recent Census Bureau projections showed that under a "no further immigration" scenario, the minority share of our population would rise from about 35 percent today to 42 percent in 2050. The preschool (under age 5 ) population would become minority white. The greater minority presence would arise from higher natural-increase rates for minorities than for the aging white population."