Answer:
a
Explanation:
They used the windmills for water on the land and they used barbed wire fences to keep the cows in different part of the land so that they won't eat all the grass. The cotton gin help farmers get cotton so they can sell it to get money. They didn't use forts.
The leauge of nations was a mutual defence agreement made after ww1 to help solve international desputes
Salt and gold is the answer
It's a foreign policy because it involves acting with another country. For example, if a country refuses to accept refugee immigrants it might change diplomatic relations with that country.
it's also domestic because it affects how the country runs. Immigrants affect employment rates because more people willing to work tends to mean lower wages. They also affect the economy because it means that there are more people buying and selling.