Did the 13th, 14th, and 15th Amendments to the Constitution bring a “new birth of freedom” as is often claimed?

Option 1: Did the upper classes and lower classes fight in WWI with the same expectations?  Which Americans, if any, benefited from the war?  Did anyone protest the war?  If so, who, why, and how?

Option 2: Did the 13th, 14th, and 15th Amendments to the Constitution bring a “new birth of freedom” as is often claimed?  If yes, how?  If not, why?