Tuborg, I took you up on the challenge to find data from the 1960's until today. Luckly Montgomery County Parks and Planning has the income data for 1969, 1979, and 1989. I'll transfer the Median Family Income in to today's dollars to show how much money people made then compared to today in each of the counties.
Here's the foromula I used Salary in constant Dollars (Recent Year) = Salary in Current Dollars (Old Year)*(CPI in Recent Year/CPI in Old Year)
1969 Median Family Income (In Today's Dollars) 5.493
Montgomery County, MD $90,234
Prince George's County, MD $67,230
Ann Arundel County, MD $61,981
1979 Median Family Income (In Today's Dollars) 2.776
Montgomery County, MD $91,807
Prince George's County, MD $70,857
Ann Arundel County, MD $68,764
1989 Median Family Income (In Today's Dollars)1.625
Montgomery County, MD $100,730
Prince George's County, MD $78,765
Ann Arundel County, MD $80,772
1999 Median Family Income (In Today's Dollars) 1.21
Montgomery County, MD $101,682
Prince George's County, MD $75,585
Ann Arundel County, MD $83,512
M-NCPPC: Median Household, Family, and per capita income, Montgomery County Region
Clearly you were right Turborg while Prince George's has clearly never been as wealthy as Montgomery it was certainly in the Top 4 Counties in the DC/Metro Area in 1969. However, the corruption and mismanagement and poor urban planning of the 1960's clearly had a drastic effect on the outcomes over the last 30 years. Notice poverty rates rose sharply during the 1990's in the county as there were more poor families, which brought down the median income from a decade earlier. I guess the combination of white flight housing price drops made it very affordable for poorer black families to move into the inner beltway, which lead to poorer schools, cheap rents, and an overall decline in value for the county. The only way to reverse the mismangement of the 1960's and large influx of poor families during hte 1990's is to start destroying the unplanned urban sprawl, that happend. I feel sorry for all the affluent blacks that moved there in the 1980's just to be followed out there by their poor. This is the real problem. I think this is even more of a reason you cannot have a majority black county and expect it to compete with wealthy majority white counties. The affluent blacks always have to pay the highest burden for the poor, crime causing, illiterate poor blacks. It's a no win situation they'll constantly follow the hard working affluent blacks out and ruin their neighborhoods and communities. As i've often hard "Black people cannot have anything without the poor one's ruining it for the bunch"
1. The inner beltway needs to be revitalized
2. Let market forces push the poorer residents to find houses else where
3. Lower taxes on high tech companies and more affluent residents (middle and upper middle classes)
Just a few thoughts. I think a tech corridor along route 50 between Prince George's and Ann Arundel would be great for the state of Maryland. It could help solidify the area's between 270 and 50 and create highly skilled jobs, which the county needs. Overall it would be great for the state.