In response to the demand for internal improvements, president james madison: a. spoke out vigorously against what henry clay called the "american system." b. approved a law that created the interstate highway system that we have today. c. called for a constitutional amendment to empower the federal government to build roads and canals. d. signed into law john calhoun's bill for federally financed internal improvements. e. created a government- funded steamboat company that revolutionized river transportation.