Why do western europeans generally have a higher standard of living than do eastern europe?

What was the focus of the stanford study-pls

Brainliest asap!me : ) has anyone read the poem, no, love is not dead? ? i have a question about it .. : )

Which two tribes were closely related allies of the wichita? a. the lions and the kiowa apache b. the kadohadacho and the pawnee c. the osage and the quapaw d. the tawakoni and the waco