Today, many take it for granted that there is a president in the United States, along with two houses of Congress. When the Constitution was being written, none of this was certain. Take a moment to imagine: how could the US. Constitution have been different?

What is the main difference between primary and secondary sources? a. primary sources are historical documents, and secondary sources are modern-day documents. b. primary sources are derived from museums and archives, and secondary sources are created by history students and academics. c. primary sources are found in ancient places with a rich history, and secondary sources are found in historical journals and blogs. d. primary sources are created during a particular historical era, and secondary sources are created by studying primary sources.