Why Did American Manufacturers,unlike Their European Counterparts,invent Labor-Saving Methods and Devices

Why did American manufacturers,unlike their European counterparts,invent labor-saving methods and devices during the first half of the nineteenth century?

A) The government offered tax incentives to new innovations and inventions.
B) Workers were unreliable and lacked the work ethic needed for optimal production.
C) American colleges had superior engineering schools that encouraged innovation.
D) Workers were in limited supply and thus more expensive.