Final answer:
At the end of the nineteenth century, labor relations were marked by significant violence and numerous strikes as workers fought for better conditions, despite the emergence of labor unions like the National Labor Union and the Knights of Labor.
Step-by-step explanation:
Labor relations at the end of the nineteenth century were characterized by violence and thousands of strikes. This period was marked by considerable conflict between labor and management. Poor working conditions, income inequality, and low wages drove workers toward frustration and collective action. Strikes became common as workers sought to improve their lot, but these actions often led to violent confrontations. Efforts to organize labor, such as those by the National Labor Union and the Knights of Labor, encompassed a broad membership base, but public opinion turned against them following violent incidents. Although the American Federation of Labor later emerged and labor unions continued to grow in numbers, by the end of the century most American laborers remained unrepresented, leaving them vulnerable to the power of factory owners.