This is the 1552nd most frequent Japanese word.
侵略
Invasion; aggression; incursion.
The word '侵略' is used here to denote a military invasion or act of aggression against a nation.
彼の国は侵略を受け、苦しい状況に陥った。
His country was subjected to invasion and fell into a difficult situation.
Here, '侵略' refers to the general historical concept of nations or entities invading one another.
歴史の授業で世界の侵略の歴史について学んだ。
In the history class, we learned about the history of invasions around the world.
In this sentence, '侵略' is used metaphorically to emphasize the act of aggression or encroachment among humans.