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| Archduke Franz Ferdinand of Austria shot to death in Sarajevo. | ||
| Austria-Hungary declares war with Serbia. | ||
| Germany declares war with Russia. | ||
| Germany invades France. | ||
| Germany declares war with France. | ||
| Germany occupies Belgium, Luxembourg and Netherlands without declaration of war. | ||
| Germany declares war with Belgium. | ||
| The British Empire declares war with Germany. | ||
| Montenegro declares war with Austria-Hungary. | ||
| Austria-Hungary declares war with Russia. | ||
| Serbia declares war with Germany. | ||
| Montenegro declares war with Germany. | ||
| France declares war with Austria-Hungary. | ||
| The British Empire declares war with Austria-Hungary. | ||
| Japan declares war with Germany. | ||
| Japan declares war with Austria-Hungary. | ||
| Austria-Hungary declares war with Belgium. | ||
| Russia and Serbia declare war on the Ottoman Empire. | ||
| France and the British Empire declare war on the Ottoman Empire. | ||
| Italy declares war with Austria-Hungary. | ||
| San Marino declares war with Austria-Hungary. | ||
| Italy declares war with the Ottoman Empire. | ||
| Bulgaria declares war with Serbia. | ||
| The British Empire and Montenegro declare war with Bulgaria. | ||
| France declares war with Bulgaria. | ||
| Italy and Russia declare war with Bulgaria. | ||
| Germany declares war with Portugal. | ||
| Austria-Hungary declares war with Portugal. | ||
| Romania declares war with Austria-Hungary. | ||
| Germany declares war with Romania. | ||
| Italy declares war with Germany. | ||
| Bulgaria declares war with Romania. | ||
| The Ottoman Empire declares war with Romania. | ||
| Bulgaria declares war with Romania. | ||
| The USA severs diplomatic relations with Germany. | ||
| China severs relations with Germany. | ||
| The USA declares war with Germany. | ||
| Cuba declares war with Germany. | ||
| Panama declares war with Germany. | ||
| Austria-Hungary severs diplomatic relations with the USA. | ||
| Bulgaria breaks diplomatic relations with the USA. | ||
| Brazil severs relations with Germany. | ||
| Bolivia severs relations with Germany. | ||
| The Ottoman Empire severs relations with the USA. | ||
| Guatemala severs relations with Germany. | ||
| Honduras severs relations with Germany. | ||
| Nicaragua severs relations with Germany. | ||
| Haiti severs diplomatic relations with Germany. | ||
| Greece declares war with Austria-Hungary, Bulgaria, Germany and the Ottoman Empire. | ||
| Siam declares war with Germany and Austria-Hungary. | ||
| Liberia severs diplomatic relations with Germany. | ||
| Liberia declares war with Germany. | ||
| China declares war with Germany and Austria-Hungary. | ||
| Costa Rica severs relations with Germany. | ||
| Peru severs relations with Germany. | ||
| Uruguay severs relations with Germany. | ||
| Brazil declares war with Germany. | ||
| First US soldiers die in battle. | ||
| Russia concludes an armistice with the Central Powers. | ||
| Romania halts conflict with the Central Powers with the Truce of Foscani. | ||
| The USA declares war with Austria-Hungary. | ||
| Ecuador severs relations with Germany. | ||
| Panama declares war with Austria-Hungary. | ||
| The Treaty of Brest-Litovsk ends the war between Russia and the Central Powers. | ||
| Romania capitulates to the Central Powers with an armistice. | ||
| Guatemala declares war with Germany and Austria-Hungary. | ||
| Nicaragua declares war with Austria-Hungary and Germany. | ||
| Romania capitulates to the Central Powers by the Treaty of Bucharest. | ||
| Costa Rica declares war with Germany. | ||
| Haiti declares war with Germany. | ||
| Honduras declares war with Germany. | ||
| The Allies conclude an armistice with Bulgaria. | ||
| The Allies conclude an armistice with the Ottoman Empire. | ||
| The Allies conclude an armistice with the Austria-Hungary. | ||
| Romania re-enters the war on the side of the Allies. | ||
| The Allies conclude an armistice with Germany. | ||
| Russia cancels the Treaty of Brest-Litovsk. | ||
| The Peace Treaty of Versailles ends the war for Germany. | ||
| Austria signs the Treaty of Saint Germain to end the war. | ||
| Bulgaria signs the Treaty of Neuilly-sur-Seine to end the war. | ||
| Hungary signs the Treaty of Trianon to end the war. | ||
| The Ottoman Empire signs the Treaty of Sevres to end the war. | ||
| The USA ends the war with Austria by a resolution of the US congress. | ||
| The USA ends war with Germany by a resolution of the US congress. | ||
| The USA ends war with Hungary by a resolution of the US congress. | ||
| The United States and Austria sign Treaty of Vienna. | ||
| The United States and Germany sign Treaty of Berlin. | ||
| The United States and Hungary sign Treaty of Budapest. | ||
| Treaty of Lausanne creates the nation of Turkey. |
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