This is the 8217th most frequent Japanese word.
布告
Proclamation; official announcement.
In this sentence, 布告 (ふこく) is used to represent a formal proclamation or declaration made by an authority.
大統領は重要な政策の布告を発表しました。
The president announced the proclamation of an important policy.
Here, 布告 conveys the sense of a formal announcement, specifically a declaration of war.
戦争布告はすべての国民に大きな影響を与えます。
A declaration of war has a significant impact on all citizens.
In this example, 布告 is used in the context of promulgating new laws, meaning an official announcement of their enforcement.