All corrections
Wikipedia July 3, 2026 at 05:33 AM

en.wikipedia.org/wiki/Sh%C5%8Dwa_era

5 corrections found

1
Claim
invade Manchuria in the summer of 1931
Correction

Japan’s invasion of Manchuria began after the Mukden Incident on September 18, 1931, not in the summer of 1931.

Full reasoning

This dates the invasion too early. Reliable histories place the start of the Manchurian crisis on September 18, 1931, when the Mukden Incident occurred and the Kwantung Army used it as the pretext to occupy Manchuria. September 18 is after summer, so describing the invasion as occurring “in the summer of 1931” is incorrect.

2 sources
2
Claim
On July 7, 1937, at the Marco Polo Bridge, the Japanese Kwantung army stationed there used explosions heard on the Chinese side of Manchuria as a false pretext for invasion.
Correction

This sentence mixes up two different incidents: the 1937 Marco Polo Bridge clash near Beijing and the 1931 Mukden Incident in Manchuria.

Full reasoning

This sentence conflates two separate events.

  • The Marco Polo Bridge Incident happened in July 1937 near Beijing (then Peiping). A U.S. State Department historical document describes it as a clash “in the vicinity of Marco Polo Bridge” and says the forces involved included the Japanese Embassy Guard and units of the Kawabe Brigade.
  • The claim about a false pretext involving an explosion in Manchuria belongs to the Mukden Incident of September 18, 1931, when the Kwantung Army sabotaged a railway near Mukden and used that as a pretext to occupy Manchuria.

So the article sentence is not just imprecise; it merges the location, troops, and pretext of the 1931 Manchurian incident into the 1937 Marco Polo Bridge incident.

2 sources
  • Historical Documents - Office of the Historian

    The U.S. State Department record reports a “clash late in the evening of July 7 between Chinese and Japanese troops in the vicinity of Marco Polo Bridge (Lukouchiao)” and says the company involved was part of “the Japanese Embassy Guard” and “the Kawabe Brigade.”

  • The Road to Pearl Harbor: The Long Fuse | The National WWII Museum

    The museum explains that “On September 18, 1931, Japanese forces stationed along the SMRR, the Kwantung Army, blew up a small section of the railroad near Mukden ... and used the incident as an excuse to fan out and occupy the entire province,” while “In July 1937 ... firing erupted with Chinese troops near the famous Marco Polo Bridge” west of Peking (Beijing).

3
Claim
On 24 November 1971, the Okinawa Reversion Agreement was ratified and returned the Okinawa Prefecture to Japanese sovereignty.
Correction

November 24, 1971 was the ratification date, not the return date. Okinawa reverted to Japan when the agreement entered into force on May 15, 1972.

Full reasoning

The article collapses two different dates into one. November 24, 1971 was when the agreement was ratified in Japan, but Okinawa was not returned to Japanese administration until May 15, 1972, when the Okinawa Reversion Agreement entered into force. So the claim incorrectly states that sovereignty returned on the ratification date.

2 sources
4
Claim
In 1957, Japan was the first country to build dedicated railway lines for high-speed travel.
Correction

Japan did not build dedicated high-speed rail lines in 1957. The Tokaido Shinkansen—the first high-speed railway system—began construction in 1959 and opened in 1964.

Full reasoning

This statement misdates Japan’s dedicated high-speed rail infrastructure. The cited 1957 milestone was the Odakyu 3000 series SE setting a speed record on a narrow-gauge conventional railway, not the construction of a dedicated high-speed line. A historical review of Japanese railways states that the Tokaido Shinkansen was the dedicated standard-gauge high-speed line and that construction started in 1959. ASME likewise identifies the Shinkansen as the world’s first high-speed railway system and dates it to 1964, not 1957.

2 sources
  • Railway Modernization and Shinkansen

    “Construction of the Tokaido Shinkansen was started in 1959 and the line was opened on 1 October 1964 ... For the first time in the world, the Tokaido Shinkansen routinely topped 200 km/h.”

  • Tokaido Shinkansen - ASME

    “In 1964, Shinkansen ... between Tokyo and Shin-Osaka became the world's first high-speed railway system.”

5
Claim
In July 1947, the Japanese government, with the encouragement of the U.S. occupation forces, established a National Police Reserve
Correction

The National Police Reserve was not established in July 1947. It was authorized in July 1950 and formally established in August 1950.

Full reasoning

This is off by three years. Standard histories of Japan’s postwar security institutions date the National Police Reserve to 1950, in the context of the Korean War. The Japanese Ministry of Defense timeline notes that MacArthur authorized its establishment on July 8, 1950, and historical sources on the force state that it was formed on August 10, 1950. So the article’s reference to July 1947 is incorrect.

2 sources
Model: OPENAI_GPT_5 Prompt: v1.16.0