What evidence is there that about one-third of cowboys were non-white?

Approximately one-third of cowboys in the American  

West were nonwhite, the largest group being  Mexican vaqueros

African Americans comprised the second-largest

group of nonwhite cowboy

Explanation:

the answer to your question is a because laws act as guidelines as to what is accepted in society. without it there would be conflicts between social groups and communities. it serves as a norm of conduct for citizens.

civil disobedience, refusal to obey the demands or commands of a government or occupying power, without resorting to violence or active measures of opposition