Japan had won its title to Taiwan and the Pescadores with the Treaty of Shimonoseki, and the successful Japanese invasion of Taiwan confirmed the Japanese in their possession. Taiwan remained firmly under the control of Japan until 1945, and all regular units of the Chinese army still on the island were either disbanded or shipped back to China. Businessmen who had backed the Japanese during the invasion prospered under their rule. Koo Hsien-jung, who had invited the Japanese into Taipei in the early days of June 1895, was granted exclusive business rights in Taiwan, making him the wealthiest Taiwanese of his time. His son Koo Chen-fu inherited his wealth and founded the Koos Group, which dominated the business sector of modern Taiwan.