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Declaration of war

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A declaration of war is a formal legal act by a national government. It is used to announce that a state of war exists or is about to begin. This act is often a performative speech act or the public signing of a document. An authorized party from a national government must perform this act to create a legal state of war. This process establishes the official relationship between two or more states during a conflict.

Franklin Roosevelt signing declaration of war against Germany
Franklin Roosevelt signing declaration of war against Germany

The mechanism of a declaration involves specific legal and political steps. In many nations, the power to declare war belongs to a head of state or a sovereign. Other systems require a process of prior approval from a legislative body. For example, the President of Brazil can declare war only after being authorized by the National Congress. In Austria, the Parliament must act before the President makes the formal announcement. These procedures ensure that the decision follows the specific laws of that country.

Historically, the practice of declaring war has changed many times. The ancient Sumerian Epic of Gilgamesh contains accounts of war. The Roman Republic used a specific ritual called the Fetials to formalize declarations. However, the strict following of these rules has not always been common. A British scholar named John Frederick Maurice studied this trend. He found that between 1700 and 1870, only 10 wars were declared in Europe and the United States. During that same period, 107 other wars were fought without any formal declaration.

International rules for starting hostilities were defined by the Hague Convention of 1907. This treaty provided the official protocol for how a nation should open hostilities. Later, the League of Nations was formed in 1919 to prevent more global conflict. Following the Second World War, the United Nations was established to try again. The United Nations Charter now prohibits the threat or use of force in international conflicts. This change has made traditional declarations of war largely obsolete in modern international relations.

The United Nations operates under specific rules to maintain global security. The UN Security Council has the power to authorize collective action under Chapter VII of the Charter. Article 51 of the Charter also protects a nation's inherent right to self-defence. This right exists if an armed attack occurs against a state. Because of these legal frameworks, formal declarations have become exceedingly rare since 1945. Most modern conflicts are handled through these international legal structures instead.

Since the end of World War II, formal declarations have mostly appeared in specific regions. These include parts of Western Asia and East Africa. Some small states have also made unilateral declarations against major powers like the United States or Russia. For instance, Egypt declared war in 1948 and again in 1967. Iraq declared war on Iran in 1980. These instances show that while rare, the formal act still occurs in specific contexts of direct military conflict.

In recent years, many conflicts have avoided the term "war" entirely. During the Korean War, US President Harry S. Truman called the conflict a "police action." In the Russo-Ukrainian War, Russia used the term "special military operation" for its invasion. These different terms can change how a conflict is viewed legally and politically. Scholars debate why declarations have declined. Some believe states use these terms to avoid international humanitarian law. Others think formal declarations are now seen as signs of extreme aggression.

Understanding declarations of war helps us see how international law works. It connects the history of ancient rituals to modern global governance. The shift from formal declarations to UN-authorized actions shows a change in how the world manages violence. Even without a formal document, the legal status of a conflict remains a central part of how nations interact. This history shows a long effort to create rules for how states behave during times of great tension.

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