a series of complicated factors caused the war, including a brutal assassination that propelled Europe into the greatest conflict the continent had ever known. The murder of Archduke Franz Ferdinand outraged Austria-Hungary. ... Austria-Hungary was furious and, with Germany's support, declared war on Serbia on July 28.
They had been used before that. they were simply intergrated to the computer programming system after along period. the power symbol was developed in ww2.
The explorers who tried to find a passage to the East by sailing around South America included all except Cortez. Hernan Cortez ( 1485-1547) was a Spanish explorer that conquered the Aztec Empire.
