world history
Refers to the history of the entire world, often as an academic subject or a broad historical overview.
大学で万国史の講義を取っている。
I'm taking a world history lecture at university.
Compound of 万国 (bankoku, 'all nations') + 史 (shi, 'history'). The exact historical derivation is uncertain, but the term follows a common Sino-Japanese pattern for academic disciplines.