Why the white south felt "poor" after the Civil War

If you look at only white Southerners and try to adjust for the Black Share of the Cotton crop from 1860 vs. 1900 you get something like this:

White Southerners Only Value of Cotton Crop Per Capita
Year	Total value	Black Share	White Share	Value to Whites Only	White Population	White Per Capita
1860	$291,259,800	15%	85%	$247,570,830	5,500,000	$45.01
1870	$329,741,386	33%	67%	$220,926,729	5,800,000	$38.09
1875	$252,977,406	33%	67%	$169,494,862	6,850,000	$24.74
1880	$313,889,353	33%	67%	$210,305,867	7,900,000	$26.62
1885	$275,599,800	33%	67%	$184,651,866	8,950,000	$20.63
1890	$396,017,756	33%	67%	$265,331,897	10,000,000	$26.53
1895	$311,493,356	33%	67%	$208,700,549	11,350,000	$18.39
1900	$393,262,475	33%	67%	$263,485,858	12,700,000	$20.75

Why the South was poor after the Civil War - Value of Cotton Crop per Capita

Southern Cotton Production 1860-1900 & Value of Cotton Crop Per Capita
Year	Bales	Lbs/bale	Price	Total value	Population	Per Capita
1860	4,860,000	461	$ 0.13	$291,259,800	9,000,000	$32.4
1870	3,122,551	440	$ 0.24	$329,741,386	9,500,000	$34.7
1875	3,832,991	440	$ 0.15	$252,977,406	11,450,000	$22.1
1880	5,761,552	454	$ 0.12	$313,889,353	13,400,000	$23.4
1885	5,706,000	460	$ 0.11	$275,599,800	14,550,000	$18.9
1890	7,311,322	471	$ 0.12	$396,017,756	15,700,000	$25.2
1895	9,901,251	484	$ 0.07	$311,493,356	17,850,000	$17.5
1900	9,436,865	479	$ 0.09	$393,262,475	20,000,000	$19.7