Please help I don’t understand any of these questions.

Which statement best explains how the invention of corporations contributed to the economy in the 1800's

What was the final spark that ignited the “european powder keg” and started world war 1

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