Allied island-hopping campaign 1943–1945: 
 Blue – Japanese-held territory Aug. 1945 
 Dark red – Allied territory 
  Red – Occupied Nov. 1943 
  Dark pink – Occupied Apr. 1944 
  Pink – Occupied Oct. 1944 
  Light pink – Occupied Aug. 1945
The Empire of Japan at its peak in 1942:
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The Naval Battle of Hakodate, May 1869; in the foreground, and of the Imperial Japanese Navy
The Empire of Japan at its peak in 1942:
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Prominent members of the Iwakura mission. Left to right: Kido Takayoshi, Yamaguchi Masuka, Iwakura Tomomi, Itō Hirobumi, Ōkubo Toshimichi
Emperor Meiji, the 122nd emperor of Japan
Ōura Church, Nagasaki
Interior of the Japanese Parliament, showing the Prime Minister speaking addressing the House of Peers, 1915
Prince Aritomo Yamagata, who was twice Prime Minister of Japan. He was one of the main architects of the military and political foundations of early modern Japan.
Baron Masuda Tarokaja, a member of the House of Peers (Kazoku). His father, Baron Masuda Takashi, was responsible for transforming Mitsui into a zaibatsu.
The Tokyo Industrial Exhibition, 1907 (Mitsubishi pavilion and Exhibition halls)
Marunouchi District in 1920, looking towards the Imperial Palace
A 1-yen banknote, 1881
Thomas Blake Glover was a Scottish merchant in Bakumatsu and received Japan's second highest order from Emperor Meiji in recognition of his contributions to Japan's industrialization.
Prince Katsura Tarō, thrice Prime Minister and the Lord Keeper of the Privy Seal of Japan. Katsura commanded the IJA 3rd Division under his mentor, Field Marshal Yamagata Aritomo, during the First Sino-Japanese War.
Map of the Japanese Empire in 1895. This map was issued shortly after the Japanese invasion of Taiwan and is consequently one of the first Japanese maps to include Taiwan as a possession of Imperial Japan.
Marquess Komura Jutaro, 1911. Komura became Minister for Foreign Affairs under the first Katsura administration, and signed the Boxer Protocol on behalf of Japan.
French illustration of a Japanese assault on entrenched Russian troops during the Russo-Japanese War
Japanese riflemen during the Russo-Japanese War
Count Tadasu Hayashi was the resident minister to the United Kingdom. While serving in London from 1900, he worked to successfully conclude the Anglo-Japanese Alliance and signed on behalf of the government of Japan on January 30, 1902.
Port Arthur viewed from the Top of Gold Hill, after its capitulation in 1905. From left are the wrecks of Russian pre-dreadnought battleships Peresvet, Poltava, Retvizan, Pobeda and the protected cruisers Pallada
Emperor Taishō, the 123rd emperor of Japan
Topographic map of the Empire of Japan in November, 1918
Native Micronesian constables of Truk Island, circa 1930. Truk became a possession of the Empire of Japan under a mandate from the League of Nations following Germany's defeat in World War I.
Commanding Officers and Chiefs of Staff of the Allied Military Mission to Siberia, Vladivostok during the Allied Intervention
Groundbreaking ceremony of Ginza Line, the oldest subway line in Asia, 1925. Front row, right to left: Rudolf Briske, Noritsugu Hayakawa, Furuichi Kōi, Ryutaro Nomura.
Count Itagaki Taisuke is credited as being the first Japanese party leader and an important force for liberalism in Meiji Japan.
Count Katō Komei, the 14th Prime Minister of Japan from June 11, 1924, until his death on January 28, 1926
Emperor Shōwa during an Army inspection on January 8, 1938
Tokyo Kaikan was requisitioned as the meeting place for members of the Imperial Rule Assistance Association (Taisei Yokusankai) in the early days.
Japanese Pan-Asian writer Shūmei Ōkawa
Rebel troops assembling at police headquarters during the February 26 Incident
A bank run during the Shōwa financial crisis, March 1927
National Diet Building, 1930
Political map of the Asia-Pacific region, 1939
Japanese troops entering Shenyang, Northeast China during the Mukden Incident, 1931
The Japanese occupation of Peiping (Beijing) in China, on August 13, 1937. Japanese troops are shown passing from Peiping into the Tartar City through Zhengyangmen, the main gate leading onward to the palaces in the Forbidden City.
IJN Special Naval Landing Forces armed with the Type 11 Light Machine Gun during the Battle of Shanghai, 1937
Signing ceremony for the Axis Powers Tripartite Pact
Founding ceremony of the Hakkō ichiu (All the world under one roof) monument in 1940
A map of the Japanese advance from 1937 to 1942
Victorious Japanese troops march through the city center of Singapore following the city's capture in February 1942 (Photo from the Imperial War Museum)
Imperial Japanese Army paratroopers are landing during the Battle of Palembang, February 13, 1942.
A model representing the attack by dive bombers from USS Yorktown (CV-5) and USS Enterprise (CV-6) on the Japanese aircraft carriers, and in the morning of June 4, 1942, during the Battle of Midway
Group of Type 2 Ka-Mi tanks on board of 2nd class transporter of the Imperial Japanese Navy, 1944–1945
The rebuilt battlecruiser sank at her moorings in the naval base of Kure on July 24 during a series of bombings.
The Japanese archipelago and the Korean Peninsula in 1945 (National Geographic)
A drawing depicting a speech in the Imperial Japanese Diet on November 1, 1945, the end of the Second World War. In the foreground there are several Allied soldiers watching the proceedings from the back of the balcony.
From left to right: Marshal Admiral Heihachirō Tōgō (1848–1934), Field Marshal Oku Yasukata (1847–1930), Marshal Admiral Yoshika Inoue (1845–1929), Field Marshal Kageaki Kawamura (1850–1926), at the unveiling ceremony of bronze statue of Field Marshal Iwao Ōyama
Population density map of the Empire of Japan (1920).
Population density map of the Empire of Japan (1940).
War flag of the Imperial Japanese Army
Naval ensign of the Empire of Japan
Flag of the Japanese Emperor

Leapfrogging, also known as island hopping, was a military strategy employed by the Allies in the Pacific War against the Empire of Japan during World War II.

- Leapfrogging (strategy)

However, starting from 1942, particularly after the Battles of Midway and Guadalcanal, Japan was forced to adopt a defensive stance, and the American island hopping campaign meant that Japan was slowly losing all of the territory it had gained, and eventually, the Americans captured Iwo Jima and Okinawa Island, leaving the Japanese mainland completely unprotected.

- Empire of Japan

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The Pacific War Council as photographed on 12 October 1942. Pictured are representatives from the United States (seated), Australia, Canada, New Zealand, the United Kingdom, China, the Netherlands, and the Philippine Commonwealth

Pacific War

The theater of World War II that was fought in Asia, the Pacific Ocean, the Indian Ocean, and Oceania.

The theater of World War II that was fought in Asia, the Pacific Ocean, the Indian Ocean, and Oceania.

The Pacific War Council as photographed on 12 October 1942. Pictured are representatives from the United States (seated), Australia, Canada, New Zealand, the United Kingdom, China, the Netherlands, and the Philippine Commonwealth
Political map of the Asia-Pacific region, 1939
Generalissimo Chiang Kai-shek, Allied Commander-in-Chief in the China theater from 1942 to 1945
A mass grave of Chinese prisoners killed by the Imperial Japanese Army in the 1937 Nanjing Massacre
Chinese casualties of a mass panic during a June 1941 Japanese aerial bombing of Chongqing
USS Arizona (BB-39) burned for two days after being hit by a Japanese bomb in the attack on Pearl Harbor.
Japanese aerial photo of battleship HMS Prince of Wales (top) and battlecruiser HMS Repulse under attack.
British forces surrender Singapore to the Japanese, February 1942
The Bombing of Darwin, Australia, 19 February 1942
Surrender of US forces at Corregidor, Philippines, May 1942
Dutch and Australian PoWs at Tarsau, in Thailand in 1943. 22,000 Australians were captured by the Japanese; 8,000 died as prisoners of war.
US General Douglas MacArthur, Commander of Allied forces in the South-West Pacific Area, with Australian Prime Minister John Curtin
Japanese advance until mid-1942
A B-25 bomber takes off from USS Hornet (CV-8) as part of the Doolittle Raid.
The aircraft carrier USS Lexington (CV-2) explodes on 8 May 1942, several hours after being damaged by a Japanese carrier air attack.
under attack by B-17 Flying Fortress heavy bombers
US Marines rest in the field during the Guadalcanal campaign in November 1942.
Chinese troops during the Battle of Changde in November 1943
Generalissimo Chiang Kai-shek and General Joseph Stilwell, Allied Commander-in-Chief in the China theatre from 1942 to 1945
Allied attack routes against the Empire of Japan
American forces landing at Rendova Island, June, 1943
The Allied leaders of the Asian and Pacific Theaters: Generalissimo Chiang Kai-shek, Franklin D. Roosevelt, and Winston Churchill meeting at the Cairo Conference in 1943
The torpedoed, as seen through the periscope of an American submarine, USS Nautilus (SS-168), in June 1942
The, the largest non-nuclear submarines ever constructed
Chinese forces on M3A3 Stuart tanks on the Ledo Road
British Indian troops during the Battle of Imphal
Marines fire captured mountain gun during the attack on Garapan, Saipan, 21 June 1944.
US Marines during mopping up operations on Peleliu, September 1944
The Japanese aircraft carrier Zuikaku and two destroyers under attack in the Battle of the Philippine Sea
The four engagements in the Battle of Leyte Gulf
General Douglas MacArthur wading ashore at Leyte
US troops approaching Japanese positions near Baguio, Luzon, 23 March 1945
Royal Marines landing at Ramree
British soldiers patrolling the ruins of a Burmese town during the advance on Mandalay, January 1945
Iwo Jima location map
Raising the Flag on Iwo Jima, an iconic photograph taken by Joe Rosenthal on February 23, 1945, depicts six United States Marines raising a US flag atop Mount Suribachi.
USS Bunker Hill (CV-17) burns after being hit by two kamikazes. At Okinawa, the kamikazes caused 4,900 American deaths.
US Marines pass a dead Japanese soldier in a destroyed village on Okinawa, April 1945
US LVTs land Australian soldiers at Balikpapan on 7 July 1945.
American B-29 Superfortresses drop incendiary bombs over the port city of Kobe, June 1945
The mushroom cloud from the nuclear explosion over Nagasaki rising 60,000 feet (18 km) into the air on the morning of 9 August 1945
Pacific Fleet marines of the Soviet Navy hoist the Soviet naval ensign in Port Arthur, on 1 October 1945.
Douglas MacArthur signs the formal Japanese Instrument of Surrender on USS Missouri (BB-63), 2 September 1945.
American corpses sprawled on the beach of Tarawa, November 1943
Indian prisoners of war shot and bayoneted by Japanese soldiers
IJA soldiers after a suicide charge on US Marine positions in Guadalcanal
Charred remains of civilians killed in the 10 March firebombing of Tokyo, codenamed Operation Meetinghouse, which killed an estimated 100,000 people, March 1945
Australian POW Sergeant Leonard G. Siffleet of M Special Unit being beheaded by a Japanese officer, Yasuno Chikao, on 24 October 1943. AWM photo.
A Filipino woman and child killed by Japanese forces in the Manila massacre
A young Chinese girl from a Japanese 'comfort battalion' being interviewed by a British officer. Rangoon, Burma, 1945
American stretcher party carrying a wounded soldier through a devastated Manila street, 23 February 1945

The Second Sino-Japanese War between the Empire of Japan and the Republic of China had been in progress since 7 July 1937, with hostilities dating back as far as 19 September 1931 with the Japanese invasion of Manchuria.

These landings prepared the way for Nimitz's island-hopping campaign towards Japan.