How Long After Pearl Harbour Was Hiroshima (And Why)?

Exact Answer: 4 Years

Pearl Harbor is one of the American lagoon harbors located on the Oahu Island of Hawaii, west of Honolulu. The harbor belonged to the United States Naval Fleet. The Imperial Japanese Navy surprisingly attacked Pearl Harbor. The attack was executed on the 7th of December, in the year 1941.



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The attack led to a sudden outrage by the United States government, and the country declared war against the Empire of Japan. The attack on the harbor was the primary reason for the entry of the United States into the Second World War. The harbor is of great significance for the navy of the United States.

How Long After Pearl Harbour Was Hiroshima

How Long After Pearl Harbor Was Hiroshima?

The Attack on the Harbor was done by the military and was primarily carried out at the naval base of the United States present at Pearl Harbor. The attack was made at around eight in the morning. All the eight Navy Battleships of the Unites States present on the harbor were damaged after heavy bombing from the Japanese Military. The attack was seven-hour long, and the Unites States navy had no answers to the Japanese military’s onslaught. The episode was named the Hawaii Operation by Japan.

As soon as the news reached the United States government officials, they declared war against Japan, and the country entered the second world war on the next day of the attack. After this incident, Italy and Germany also declared war against the United States, and soon, the second world war became more intense. The United States was heavily supported by the United Kingdom, the Soviet Union of Russia, and France.

States AttackedTime After Pearl Harbor
HiroshimaFour Years
NagasakiFour Years

After the Pearl Harbor attack, the second world war kept going for four years before the United States dropped nuclear bombs on the state of Hiroshima and Nagasaki. The atomic bomb attack was one of the deadliest attacks in the history of the war and resulted in the death of more than two lakh people. One week later, Japan announced that the country has surrendered in the second world war.

Why Did It Take So Long For Hiroshima After Pearl Harbor?

The United States and Japan were always on the verge of declaring war against each other. After the first world war, the United States started expanding its territory and military in various parts of the Pacific and Asia. Japan was well aware of all the expansions done by the United States government and was prepared to fight a war against its rival. Japan feared that the United States military might occupy different parts that were close to Japan. To ensure that the United States doesn’t become a powerhouse, Japan’s military carried out the attack.

After the United States entered into the second world war, both countries kept fighting against each other. But in 1945, the government of the United States decided to bomb the states of Hiroshima and Nagasaki of Japan. Both the cities were attacked on the 9th of August 1945. The nuclear bombing dented the economy of japan badly. The effects of the bombing were observed in the entire country. People were not able to breathe and burned away like ashes. Lakhs of people died in ten seconds.

The unfateful incident shook the entire world, and Japan surrendered the very next week. More than two lakh people died, most of them civilians, and this remains the only incident in history where nuclear bombs were used during the war. It took years for the people of Japan to recover from the attack. Even today, a few people are born without hands and damaged brains because of the radioactive attack.


Overall, it can be concluded that the attack on the naval fleet of the United States present on Pearl Harbor was the primary reason for the United States to enter the second world war. It was one of the most significant turning points of the war.

The city of Hiroshima was bombed four years after the incident on Pearl Harbor. Nuclear bombs were dropped on Hiroshima and Nagasaki in the year 1945. The bombing resulted in many casualties and was also responsible for the ending of the second world war. Japan surrendered a week after the nuclear bombing.


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