The Japanese attacked Pearl Harbor and the United States declared war on the axis powers, but why didn't they regard Japan as the number one enemy?

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On December 7, 1941, the Pearl Harbor incident broke out. 

On December 8, the United States declared war on Japan, the second World War reached its maximum scale, and the Chinese military authorities also declared war on Japan on December 9. 

However, at the same time as the United States declared war on Japan, the German Fuhrer Hitler did a very unexpected thing: although the main German forces fought against the Soviets on the eastern front, despite the defense of Moscow, the Soviets and the Germans fought inextricably. 

However, Hitler still took the initiative to declare war on the United States on behalf of the German authorities. 

This left Germany and the world rich in resources, and the United States, with great industrial potential, was openly at war. 

From the day Germany declared war on the United States, Germany will confront the three military powers, the United States, the Soviet Union, and Britain at the same time, until its defeat and surrender in May 1945. 

So why did the German head of state Hitler take the risk of fighting on two fronts to take the initiative to declare war on the United States? 

After the outbreak of the war in Europe, the German navy did its best to attack British maritime transport lines in the Atlantic Ocean. 

According to statistics, from May to October 1940, more than 280 British ships were sunk by the German navy. 

In October alone, Britain lost more than 60 ships of various types. 

The attack by Germany has cost Britain dearly, and Britain is an island country. 

However, Churchill has been "tired" in the war against the "military giant" of Germany for a long time. 

As far as Britain is concerned, it is certain that it can win by defeating Germany by its strength, but the price is extremely huge. Once Britain defeats Germany miserably, its interests will be greatly affected. 

To protect Britain's interests and make Britain lose less objectively, Churchill very much hoped that the United States would come out and do justice to Britain in the Atlantic Ocean. 

The United States also has its economic interests in Europe. Britain and the United States cooperate secretly. Britain has acquired 50 destroyers from the United States, which is the beginning of the intervention of the United States in the Atlantic naval war. 

With the support of American destroyers, the allied defense circle in the Atlantic Ocean expanded rapidly. 

In the spring of 1941, General Ernest King, commander of the U.S. Navy's Atlantic Fleet, formulated an operation called Operation Plan 3, which included 26 degrees west longitude as his defense range. 

In May 1941, Roosevelt ordered the United States Navy to track aircraft and warships, military targets of the axis powers in the Atlantic, and report every four hours. 

In late May, a destroyer of the British Navy and the German Navy exchanged fire near Denmark, and the United States listed the area near Denmark as its combat area. 

On July 7, the US military landed in Iceland and established a military base. 

In July 1941, the US authorities issued the "Common Defense Plan for the Western Hemisphere", which foreshadowed the conflict between virtue and virtue. 

In late August 1941, more than a month after the signing of the "Western Hemisphere Joint Defense Plan," the United States stipulated that the Atlantic Fleet had the right to destroy any target that threatened the Atlantic Ocean, which was tantamount to further clarifying the United States' attacks on German naval vessels and air force aircraft. 

In September, Ernest King put forward the "Operation Plan 7" to provide escort for the naval fleet from Canada to Iceland. 

As a result, clashes broke out between the US and German forces, including the USS Greer, a US Navy destroyer, and a German Navy submarine in September 1941. 

The Greer clashed with German submarines for more than 10 hours. 

Later, the USS Niki, a US Navy destroyer, launched a series of attacks on a German submarine in mid-October. 

The torpedo of a German submarine hit the deck of the Nikki, killing more than 10 American troops. 

At the end of October 1941, the USS Reuben James was sunk by a German submarine during a mission. This was the only destroyer lost by the US military before the formal war between Germany and the United States. More than 110 people in the US Navy were killed. 

The speech was straightforward. Roosevelt had listed Hitler as the number one enemy. 

Hitler is also waiting for a suitable opportunity to declare war on the United States. 

This opportunity is Pearl Harbor on December 7, 1941. 

Finally, the outbreak of the Pearl Harbor incident and the influence of the Alliance Treaty of Germany, Italy, and Japan made it necessary for Germany to declare war on the United States. 

Understanding the background of Germany's declaration of war against the United States is inseparable from the influence of the Treaty of Alliance of Germany, Italy, and Japan. On September 27, 1940, the governments of Germany, Japan, and Italy formally signed the Treaty of Alliance of Germany, Italy, and Japan in Berlin. The treaty has the following main contents, which are related to the diplomatic trend of Germany. 

First, Japan recognizes the "new order leadership" of Germany and Italy in Europe. 

Second, Germany and Italy recognize the "new order leadership" established by Japan in East Asia. 

Third, when any of the three contracting states of Germany, Italy, and Japan is attacked by any country that did not participate in the European war or the Asian Sino-Japanese war, the other two countries should provide military assistance. 

This treaty is a direct manifestation of the military alliance of the three fascist countries of Germany, Italy, and Japan. Both Japan and Germany and Italy recognize each other's acts of aggression as "reasonable" and "justified". More importantly, Article 3-- when any of the three countries of Germany, Italy, and Japan is under military attack by any country not participating in the war in Europe or the war between China and Japan in Asia, the other two countries shall give military assistance. 

It provides a "direct endorsement" for Germany to declare war on the United States. 

However, on December 8, 1941, after the Pearl Harbor incident, the United States declared war on Japan. The US declaration of war on Japan is equal to the provision that "when any of the three countries of Germany, Italy, and Japan are subjected to a military attack by any of the three countries that did not participate in the European war or the Sino-Japanese war in Asia, the other two countries will give military assistance," to apply this provision, the United States and Japan are in a state of war, and Germany will fight the United States in military support for Japan. 

We should also be at war with the United States, which is responsible for the "axis" of Germany, Italy, and Japan. 

Based on this clause, Germany voluntarily declared war on the United States on December 9. 

In a word, before the Atlantic naval battle, Germany collided directly with the United States in the Atlantic, the exchange of fire between the United States and Germany continued to escalate, and the United States became more and more involved in the Atlantic naval war. 

Germany and the United States were actually at war before Pearl Harbor. 

After the outbreak of Pearl Harbor, the Treaty of Alliance of Germany, Italy, and Japan allowed Germany to formally declare war on the United States when the United States declared war on Japan, and World War II reached the largest scale.