How did John D. Rockefeller and Andrew Carnegie build fortunes in the oil and steel industries? Be specific. You should discuss horizontal and vertical integration in your answer.

Respuesta :

Answer:

They built fortunes in the oil and steel industries since many people used oil lamps adding iron backing help them last longer.

Explanation:

They built fortunes in the oil and steel industries since many people used oil lamps adding iron backing help them last longer.