I would say the Jim Crow laws
The main appeal for the indenture contract for someone looking for work was that it was short time period compared to the amount of money exchanged. When people started sailing over the "New World", young people who have enough money would ask people or specifically rich families to work for families for no pay.
Steam locomotive,because they were built during the Industrial Revolution.Which happen during late 1800's
Translation: In your language arts notebooks, complete the crossword puzzle on different ways of communication. (something along these lines)
The Chinese didn't want there people using it but, people kept secretly selling it to there people. I am pretty sure that's the answer... You might wanna do a little more research cause it could be the other way around