If you could answer 3 or 4 it would be helpful. Please give me an absolute answer. I really need help. :')

How was louis and clark expedition event unfolding and what was going on

The north was victorious in the battle of bull run true or false

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 a. primary sources are historical documents, and secondary sources are modern-day documents.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.