How and why has the nature of money changed in the United States from the founding of our republic in the 1790s until the year 2012? Note to students. This is a very broad question. Your response should cover the most important points. You may divide your answer into information about five eras: 1790 to 1860, 1860 to 1913, 1914 to 1971, and 1971 until 2012.