However, more than 70% of all immigrants reached New York City, which became known as the "Golden Door." Most immigrants arriving in New York came to the Castle Garden depot near the tip of Manhattan in the late 1800s.
I think it is B. Fait money only has value as a medium of exchange but idk put it and see if im right I researched it and got that so let me know if im right :)
The answer to your question is C
I believe the answer is Barbed Wire.
Befor the inventions of barbed wire, the Cattles are let to roam freely across the plains and the owners are required to pay a lot of cowboys to supervise them so they didn't go missing. Witht he invention of barbed wire, they can keep the cattle in a secure place without supervision.
They were all used to determine whether the new states would be either free states or slave states
