This is the 17569th most frequent Korean word.
세계사가
"세계사가" means "world history" in English.
Here, '세계사가' refers to the subject of world history as a general concept of study and interest.
나는 세계사가 정말 재미있다고 생각해요.
I think world history is really interesting.
In this sentence, '세계사가' denotes the subject or course often officially included in an academic curriculum.
이번 학기에 세계사가 교과 과정에 포함되어 있습니다.
World history is included in the curriculum this semester.
Here, '세계사가' is used as a topical focus of a discussion on its relation to understanding humanity.