The steam engine as it was to be used in many machines such as trains, steamboats, factories, farming equipments, etc.
Answer: The Wagner Act, or the National Labor Relations Act, was a New Deal reform passed by President Franklin Roosevelt on July 5, 1935. It was instrumental in preventing employers from interfering with workers' unions and protests in the private sector.
Explanation:
Answer is A: Mongol made up the ruling class of the Yuan Dynasty
