declaration of war
宣戦布告
Ongoing wars (mostly undeclared)
Frozen conflict
List of wars extended by diplomatic irregularity
Letter of protest
Declarations of war during World War I
Declarations of war during World War II
Declaration of war by Canada
Declaration of war by the United Kingdom
Declaration of war by the United States
United States declaration of war upon the United Kingdom (1812)
German declaration of war against the Netherlands (1940)
United Kingdom declaration of war on Japan (1941)
State of emergency
Jihad, a declaration of war in Islam
Undeclared war
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wikipedia declaration of war
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jisho declaration of war