You should be done defending against the US Navy, so invading Australia and United States islands is ideal.

The Japanese still have very powerful generals at this point in time so use them to your advantage. After your challenging conquest in Asia is over, advance into Europe and save the European Axis Powers from the Communist and western forces. Liberating Asia will not be that easy because you have the US Navy to deal with. The Chinese, Indians, and the rest of the Allies in Asia are still no push overs so try to build as strong a army as you can and liberate Asia. Japan in 1943 is the key to counterattacking the Soviet Union offensive into Germany. After you liberate all of Europe you can invade North America and finish the fight. Once the US Navy is gone, you can advance through Europe easily and catch the Soviet Union off guard and invade them while they liberate Germany. You should be half way done destroying the United States Navy so try your best and finish them off. After you conquer Asia, advance onto Europe to help your German, Italian, Spanish, Finish, and Balkan allies as soon as possible. Going through Mongolia and Northern China is the key to victory in Asia. Do not underestimate China, India, or Australia in any way or they will rush you, try to take your invasion of Asia in a balanced manner. China is another threat because their generals are just as good as the British and are no pushovers. When playing as Japan in 1939, try going after the supplies in Eastern, Southern, and South East Asia as quickly as possible. The United States is your biggest threat when playing as Japan in 1939, so don't underestimate them. The United States will always produce a better navy later in the conquest so be prepared for a possible invasion of mainland Japan. Since your navy is strong you can take advantage of the resources near the Chinese coast. Playing as Japan will be challenging because like Germany you are surrounded. In 1939, the Japanese have a strong navy and very powerful and skilled generals like Germany. The recently established Self-Defense Forces then regrouped in Hokkaido and Northern Honshu. During the Alien Invasion they were pushed out of Kyushu, Shikoku and Western Honshu. The defeat of Nazi Germany left Japan to fend for itself and even with their powerful navy, defending against the United States and its allies proved to be costly both economically and militarily.ДЄfter their defeat they lost their military like Germany, however due to tensions brought by the Cold War they were allowed to form the Self-Defense Force and became an affiliate of NATO. In the 1943 conquest, Japan has conquered British Malaya, French Indochina, the East Indies and the Philippines which boosted the Japanese war effort. In the 1939 conquest, Japan has control over Korea, Manchuria and Taiwan, which made Japan very powerful country. The Empire of Japan was determined to bring the entirety of Asia under its rule using its Armed Forces, starting with the Japanese invasion of Korea and Manchuria. Japan is a principal member of the Axis Powers, the Union and is an associate of NATO. Japan is a Great Power (later a Regional Power then even later a Minor Power) in The Asia-Pacific.

World conqueror 4