What was the purpose of the monopolies of salt and iron

I assume you mean in the past, and not the near past, but something like a century ago. Salt was a precious commodity used for preserving meats longer as people couldn't freeze it; plus, it added flavor to dull, unseasoned food. Iron is a strong alloy used in lots of things, and a century ago, people loved METAL machines that could get work done faster.

A. would be the correct answer because when african americans moved from there to kansas they worked for the people they lived with