B. <span>To deter an invasion from the United States and to Counter the U.S. missiles in Europe and Turkey... Because the U.S. had missiles in Turkey they could threaten the soviets so to counter that they placed missiles in Cuba.</span>
They created a democracy untainted by wealth, privileged birth or corruption where every (eligible) citizen can take part in politics/ assembly.
C. Missouri
In fact, the Oregon Trail began in Missouri.
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.