15 POINTS + BRAINLIEST . PLEASE HELP.

What were some of the most important native items adopted by europeans ? what impact did they have on european life ?

Were african-americans allowed to serve in the military in wwi?

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 a. primary sources are historical documents, and secondary sources are modern-day documents.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