Mohenjodaro. Since the first discovery of this civilization in 1920-21 at Harappa in the Indus Valley, hundreds of sites spread over more than a million square kilometres in the Indian subcontinent have been excavated, many of these are in Northern and Western India.
The immediate cause for World War 1 was the assassination of the Archduke Franz Ferdinand of Austria and his pregnant wife Sophie. Archduke Franz Ferdinand of Austria was the nephew of Emperor Franz Josef and heir to the throne of Austria and Hungary.
Soon other European nations began to take sides. World War I thus started with two opposing factions, the Central Powers and the Allies. The war spread across Europe and engaged other nations such as the US. At first it was called the Great War, and later The First World War.