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the second world war began when hitler invaded poland when he had promised that he would not. great britan and france had responded shortly after the invasion and declared war.
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German forces attacked the Low Countries. On May 14, German troops advanced through the Ardennes and began driving to the English Channel. Despite their best efforts, the British Expeditionary Force Belgian, and French forces were unable to halt the German advance
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an American B-29 bomber dropped the world's first deployed atomic bomb over the Japanese city of Hiroshima. The explosion wiped out 90 percent of the city and immediately killed 80,000 people; tens of thousands more would later die of radiation exposure.
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It was the largest armed conflict in history, spanning the entire world and involving more countries than any other war, as well as introducing powerful new weapons, culminating in the first use of nuclear weapons.
