AACo is not "southern Maryland", lol. Or at least not the parts that are diversifying, and Hispanic growth there is on par with Black growth (and roughly on par with Hispanic growth in Charles, actually, but of course far less than the never-ending PG spillover that made it one of only two Dole-Gore counties nationwide).
Like the 'South', the definition of what constitutes 'southern Maryland' depends on who you ask. According to the Maryland Department of Natural Resources for instance, all of Anne Arundel County is considered part of this region:
sourceI will take their word over yours, thanks.
As to Anne Arundel becoming minority-majority, the trend is clear to anyone:
2000 censusWhite: 81.2%
Black: 13.6%
Asian: 2.3%
Hispanic: 2.63%
Two or more races: 1.7%
2010 censusWhite: 75.4%
Black: 15.5%
Asian: 3.4%
Hispanic: 6.1%
Two or more races: 2.9%
2020 censusWhite: 65.2%
Black: 17.4%
Asian: 4.3%
Hispanic: 9.65%
Two or more races: 5.3%
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So it looks like the 2030 census will be the last time whites will have a majority in the county.