Answer:
Primary
Explanation:
It's research published in scholarly/academic journals. (a textbook)
James Monroe, Hope this helps;)
The Lincoln monument has 36 pillars because at the time of Lincoln's assassination, there were 36 states in the Union.
Marco Polo is very well known for his travels on this silk road as well as his 24-year journey to Asia. Throughout this time he became very well acquainted with the people he encountered and became a confidant of Kublai Khan. Since Kublai Khan was the Khagan of the Mongol Empire this allowed Marco polo to fit in better.
