It doubled in size or to be exact 828,000 square miles.
When he said he felt an "a sunburst of deliverance" he meant he felt a sense of freedom. As in, the war is over, I can go home, and a big stress has just been lifted off my shoulders.
Answer:
For over 15 centuries, the relationship between Japan and Korea was characterized by cultural exchanges, economic trade, political contact and military confrontations, all of which underlie their relations even today. ... Japan took control of Korea with the Japan-Korea Annexation Treaty of 1910.
