What event started "bleeding kansas"?

Which of the following american companies had a monopoly in the late 1800s? a. deere and company b. sears, roebuck and company c. standard oil company d. general electric company

In the mid-1800s, native americans who had lived in the westtraded their manufactured goods with settlers.were able to resist diseases carried by settlers.offered their services as guides to settlers.prevented settlers from moving onto their territory.

Was the us justified in using the atomic bomb on hiroshima and nagasaki? why or why not?