What led to the formation of labor unions during the second industrial revolution?

During the Second Industrial Revolution, the labor movement in the United States grew out of the need to protect the common interest of workers. These labor unions fought for better wages, reasonable hours and safer working conditions as during that time, the working conditions in factories, mills, and mines were terrible. So workers joined together and created unions in order to fight for their safety and better and increased wages.

i believe he was the 5th king of uruk. so c

spanish executed counts egmont and horne in brussels.