This is the 18th most frequent Korean word.
미국
The Korean word "미국" means "United States" or "America" in English.
In this sentence, '미국' refers to the United States as a location where the action of studying is desired to take place.
나는 미국에서 공부하고 싶습니다.
I want to study in the United States.
Here, '미국' is used to describe the origin or attribution of the culture, meaning 'American' as an adjective.
미국 문화는 매우 흥미롭습니다.
American culture is very interesting.
In this context, '미국' is part of a noun phrase that identifies the nationality of the person, indicating she comes from the United States.