What did Japan accomplish militarily during World War 2?

Japan accomplished the same thing that it's partner Germany did; they both accumulated a lot of foreign territory (countries). On the technical side, the Japanese advanced the uses of the aircraft carriers, which included outstanding fighters, dive bombers, & torpedo aircraft; massive sized submarines, the largest in the world at that time; aircraft carrying submarines; Germany, Japan & Italy all used midget (mini) submarines; the most powerful battleships in the world - Yamato & Mushashi (Nine 18-inch guns/rifles, 70,000 ton displacement), and the most powerful torpedo during WWII, the "Long Lance."