How did the monroe doctrine lead the way for u. s. imperialism?

It brokered an agreement to protect conquered African nations from European influence

answer; ///i believe that the correct answer is ; hieroglyphs or glyphs; the maya script, also known as maya glyphs, was the writing system of the maya civilization of mesoamerica; as always plz check first..good luck

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;