A.
Plains Indians started hunting buffalo more efficiently.
Answer: B. Diplomats
Explanation: diplomats are deployed to specifically work for their country, hence why they represent their country.
During the nineteenth century, American farmers had to face different economic problems such as oversupply or poverty. However, they always found a solution to these problems to continue working.
During the early nineteenth century, the United States was a predominantly rural country and a large part of its population belonged to the working class and farmers. Farmers settled on the great plains.
During this time there was a large amount of vacant land, which attracted the attention of different people to establish themselves and claim them as their own, this situation caused an oversupply of agricultural products to be generated in the medium term, which affected all the farmers of this area.
Also, the development of rail lines was an opportunity to transport their products in a faster way. However, the owners of the railways took advantage of this and charged high fees so many poor farmers had to continue using conventional means of transport such as horses that took longer.
Note: This question is incomplete because the text is missing. However, I can answer it based on my prior knowledge.
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They had better weapons and also because they developed the chariot. Even though the chariot is thought of as Greek, Roman or Egyptian, it is actually the Hittites that it originally came from.