WORLD HISTORY

Detailed explanation-1: -On July 28, Austria-Hungary declared war on Serbia, and the tenuous peace between Europe’s great powers quickly collapsed. Within a week, Russia, Belgium, France, Great Britain and Serbia had lined up against Austria-Hungary and Germany, and World War I had begun.

Detailed explanation-2: -Austria-Hungary, with German encouragement, declared war on Serbia on 28 July. Russia’s support of Serbia brought France into the conflict.

Detailed explanation-3: -It is generally accepted that World War II began on September 1, 1939, when German troops invaded Poland, prompting the leaders of France and Britain to declare war two days later. However, as this conflict expanded, it merged with existing hostilities between Japan and several other countries in Asia.

Detailed explanation-4: -World War I had two main factions: the Central Powers, which included Germany, Austria-Hungary, Bulgaria and the Ottoman Empire; and the Allies, which included France, Great Britain, Russia, Italy, Japan and later, the United States.

Detailed explanation-5: -On July 28, 1914, one month to the day after Archduke Franz Ferdinand of Austria and his wife were killed by a Serbian nationalist in Sarajevo, Austria-Hungary declares war on Serbia, effectively beginning the First World War.