The only proven ways to alleviate – not eliminate – poverty are:
1) Tackle corruption. There are no rich corrupt states (leave out the oilers), and no poor honest ones.
2) Educate women; the ROI is phenomenal.
3) Respect women’s right to work and keep what the earn.
That’s it. Good geography helps, but in a nutshell the key is an honest administration (and courts) and educated women in the workforce.