Why did pioneers finally decide to settle in the Great Plains?

Which of the following is one example of an ideological conflict that became one of the causes of world war ii?

Why did china build the great wall of china?

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.