That's pure bunk.
When an entire section of the country is driven into enforced poverty while its political institutions are taken over by a radical political party backed by the US military and the states of that section are driven into debt with all the proceeds robbed and taken back north where the appointed crooks came from, you can't blame the poverty of the region on anything other than what caused it.
What caused it was your political party. While they were in power, the grossest abuses of authority in the history of this country occurred. The genocide of a race of people was carried out in the western territories while the subjugation of nearly half the country was being carried on as a matter of official federal policy.
Your posturing over what you imagine you know is infuriating. For the love of God, man, get your head out of the sand and do some research. Having your mind made up before you turn the first page is typical of liberals. Surprise me for once and act like a man instead of like a hypnotized sheep.