How did Mecklenberg County, NC (Charlotte) become so liberal?

[Arbitrage1980]

W Bush won it in 2000, and lost it by a few points in 2004. But beginning in 2008, the Democrats have been winning it by huge margins. Hillary won it by around 30 points this past election. What's going on? I know Charlotte has exploded population wise, so is it due to liberal northerners moving in?

[Arbitrage1980]

Demographics of Mecklenburg, NC:

2000:

64% White
28% Black
  6% Hispanic or Latino
  3% Asian
  3% Two or More Races

2010:

51% Non-Hispanic White
31% Black
12% Hispanic
  5% Asian
  3% Two or More Races

2015:

48% Non-Hispanic White
32% Black
13% Hispanic
  6% Asian
  2% Two or More Races

Had no idea the demographics changed that rapidly. That explains most of the GOP's decline there. Trump did however lose 28 precincts in Mecklenburg that voted for Romney. These are affluent white areas that normally vote GOP. Trump's weakness with college whites definitely concerns me.