What does the book expression “Casus belli” mean?

The expression "Casus belli" is a Latin phrase that literally translates to "case of war." It is used to refer to a justification for starting a war, or a provocation that is seen as an act of aggression and thus gives a nation the justification to declare war on another. It is a legal term used in international law to refer to a legitimate cause for war and is often used in the context of self-defense.

In international law, a casus belli is a situation that provides a nation with a legitimate cause to declare war on another. It is a concept that has been used throughout history and was first codified in the 1648 Treaty of Westphalia. The treaty established the principle of sovereignty and the right of nations to defend themselves in the event of an attack. It also set out the conditions under which a nation could declare war on another, including a casus belli.

In modern times, a casus belli is seen as a legitimate justification for war. It can be a direct attack on a nation, such as an invasion or an act of aggression. It can also be an indirect attack, such as a violation of a nation's sovereignty or a violation of international law. A casus belli is often seen as a way to prevent a war, as it gives a nation the legal justification to declare war on another.

In conclusion, the expression "Casus belli" is a Latin phrase that refers to a justification for starting a war. It is a legal term used in international law to refer to a legitimate cause for war, such as a direct or indirect attack on a nation or a violation of international law. A casus belli is seen as a way to prevent a war, as it gives a nation the legal justification to declare war on another.