Expplain subsidary allience. pls me solve this

I’m annoyed but glad that my history teacher left and quit her job as a teacher to become a flight attendant

How did the cleveland massacre impact standard oil in 1872? standard oil hired all the laborers who were nearly killed during the cleveland massacre. standard oil became a monopoly in the cleveland oil market after the cleveland massacre. standard oil was bought out by other companies in the city after the cleveland massacre. standard oil closed down to avoid additional violence in the wake of the cleveland massacre.

Why was the pension issue relevant to the politics of cleveland's presidency?