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.

the answer is a. laws were enacted in the aftermath of the plot to make it harder to free slaves,increasing sectionalism

1. where does the energy of a nuclear power plant come from?

d) political bosses should not hold office