This song was originally published as "O! Let My People Go: The Song of the Contrabands.
The answer is 130 million books have been written
The African-American in Montgomery, Alabama resumed riding buses when the United States Supreme Court that segregation of buses is unconstitutional. The Montgomery Bus Boycott took place in December 5, 1955 to December 20, 1956 in which African-Americans declined to ride buses as a civil rights protest after Rosa Parks was arrested due to her refusal to give her seat to a white man.
Terrorists go after civilians, wear no thing as a uniform and they try to blend in with the population in hopes of not getting caught. There are no standards that can dictate how they will act, and or what their goal is. They murder women, children, and anyone they please.
However, Conventional warfare, is a set of battles army vs. army. Take World War II as an example. Germany and its allies got their militaries together and fought against their allies. It is a military on military conflict. Both sides wear the uniform and only fight against those who wear the uniform in hopes of defeating the other force that withstands military might.