Amidst the turmoil brewing between the Nationalist and Communist parties who were vying for control of China at the time, Japan had launched an invasion of Manchuria in 1934 and began to creep steadily inland. China, the Nationalist party in particular, owed Japan immense amounts of money, which they could not pay whilst infused in their own civil war. The Treaty of Versailles promised the Japanese government land in China in return for forgiveness of their debt. This ended up not being a popular sentiment and was rallied against all over the country, and most famously during the May 4th Movement in Beijing in 1919. When the Chinese did not readily give up their rights to their land, Japan tried to take it by force. This was the beginning of World War II in the Pacific Theater.