Primary sources are from the sources themselves! Secondary sources can be slightly altered, or tweaked to great a better understanding for audiences. Primary sources can tend to have more information presented in an abstract way, while secondary sources have similar information but in an easier way to understand, with potential bias.
I dont really understand the question ur asking
Answer:
America's cause was important to all people.
The invention from Song, China that had the greatest influence on the spread of learning was paper and printing. This helped to get the public interested in reading.
