Since the United States and the Soviet Union imposed an oil embargo on Japan, Japan has lost some series of advantages such as navigation and aviation, and in order to make the United States relax, Japan has also launched a war: air raids on Pearl Harbor, World War II also broke out in an all-round way, and in the war against Japan, in addition to the Pacific, China is the main position.
In 1929, the United States broke out an economic crisis, the economic crisis let the United States into the "ten years of the Great Depression", but also swept the entire capitalist world, Japan wants to rely on the American market, but also suffered a heavy blow, serious economic losses, coupled with Japan's limited resources.
On September 18, 1931, Japan launched a war of aggression in which 35 million compatriots were sacrificed until August 1945, when Japan announced its unconditional surrender under the intimidation of two atomic bombs.
However, Japan was not the first to declare war on China, and some people may say that the first to declare war on China was Britain, which belonged to the end of the Qing Dynasty, and Britain sent emissaries to open up the market to visit Qianlong, on the one hand, to celebrate Qianlong's birthday, and on the other hand, to hope that Qianlong could open a treaty port.
But Qianlong refused, the British did not return, but the British did not stop selling goods to the Qing Dynasty, in order to quickly open the Qing Dynasty market, the British disregarded the ban issued by the Daoguang Emperor, a large number of opium, and Lin Zexu's Humen smoke became the fuse of the First Opium War.
But both Britain and Japan are acts of aggression, not the first country to formally declare war on China, the first to declare war on San Marino, one of the smallest countries in the world, located in southern Europe, in the east of the Italian peninsula, with a total area of only 61.2 square kilometers.
Why such a country across the mountains and the sea to declare war on China, in fact, from the Hague Convention, the rise of Britain and France in the 18th century, rapid colonial expansion at sea, and Russia is somewhat weak among these powers, in order to win time and limit opponents, in 1898 the Russian Emperor proposed to hold a peace conference in The Hague, the Netherlands.
The meeting was attended by 26 countries, including China, the United States, France, Japan, Italy, etc., and 26 countries issued 3 conventions and 3 declarations through consultation, among which was the Convention on the Beginning of War, and the first stipulation: The contracting States shall recognize that they shall not begin hostile acts against each other unless there is a prior and unambiguous warning.
That is to say, before the war begins, a "war book" must be submitted, in which one country terminates the state of peace between the two countries and turns into a state of war, but imperialism and hegemonism often go to war undeclared in order to gain military superiority and political advantage when launching a war of aggression.
On June 26, 1944, the British Air Force carried out four consecutive "indiscriminate bombings" against San Marino, which completely angered San Marino, so they declared war on both the Allies and the Allies, and of course China also received a declaration of war, which was the first time China received a declaration of war.
However, San Marino wants to send troops to the world, then the national force to send up to 1,000 troops to China, it is the opponent of Britain and Germany, San Marino became the warring position of the British and German armies, after repelling the German army, Britain signed a peace agreement with San Marino, Britain withdrew from San Marino, and San Marino also canceled the declaration of war on the Allies.