What method of research compares data from one time period between two or more nations?

a. comparative historical research
b. cross-sectional comparative research
c. historical events research
d. historical process research

b. cross-sectional comparative research

Explanation:

This is the term that best describes the comparison of data from one time period between two or more nations. Cross-sectional comparative research is very useful to historians as it allows them to better understand the conditions that existed around the world during a particular time period. It also allows them to understand how location and context influenced the experiences of people of particular historical events.

a.

congress passed laws allowing for free passage between states.

adopted the practice of proskynesis, a persian court custom that involved bowing down and kissing the hand of others, depending on their rank.