For those in the industrial sector, organized labor unions fought for better wages, reasonable hours and safer working conditions. The labor movement led efforts to stop child labor, give health benefits and provide aid to workers who were injured or retired.
The correct answer is A. While the states are free to make their own laws they cannot make laws that violate the constitution. For example a state cant legalize murder.
By selling land given to them to build the railroad
Explanation:
The government gave the railroad companies large amounts of land to sell both so that the railroad companies earn some money and so they can speed up the settling of the frontier.