How did small pox vaccine impacted American ?

Reformers worked to change schools by making them more:

Which statement best describes standard oil in the late 1800s? standard oil controlled only a small number of the nation’s oil refineries. standard oil was a single business that operated in a small region. standard oil controlled only the means and methods of oil production. standard oil owned ninety percent of all oil refineries in the united states.

How does the balance of trade look different in the us today vs hot it looked in the 70's