World War II marked by 50 to 85 million fatalities, most of whom were civilians in the Soviet Union and China. It included massacres, the genocide of the Holocaust, strategic bombing, premeditated death from starvation and disease, and the only use of nuclear weapons in war. Japan, which aimed to dominate Asia and the Pacific, was at war with China by 1937, though neither side had declared war on the other. World War II is generally said to have begun on 1 September 1939, with the invasion of Poland by Germany and subsequent declarations on Germany by France and the United Kingdom. From
What Hurts the Most 100 as well as their lowest-charting lead single. Aside from charting on the Hot 100, the song managed to peak at the top of "Billboard" Hot Dance Club Songs and at number twenty-eight on the US "Billboard" Pop Songs. Despite its low peak on the Hot 100, the song managed to sell more than 500,000 downloads, earning a Gold certification by the Recording Industry Association of America in October 2009. In Canada, the song managed to peak at number fifty-four and lasted on the chart for eleven weeks. The music video for "What Hurts the Most" was filmed in Los