The answer was wrong before, please review it first. First of all, upstairs is very accurate. Hitler's so-called failure should refer to the occupation of Japanese territory by foreign troops. Hitler couldn't understand the situation in Japan, and at most he just listened to the Japanese. Even most Japanese didn't know about Japan until after the Sino-Japanese War of 1894-1895, when Europeans were even less familiar with Asia.

As for the history of 3,000 years, take the history of China for example. The word-making of Emperor Cang Xie Chiyou is a legendary era, and it is impossible to judge its authenticity. According to the emergence of the first dynasty, the Xia Dynasty (2070 BC), China has a history of only 4,000 years. However, there are many records about Xia Dynasty in China traditional literature. However, because they were written relatively late, and there is no recognized direct evidence of the existence of the Xia Dynasty, such as the words of the same period of the Xia Dynasty as self-evidence, the authenticity of the existence of the Xia Dynasty has been questioned by modern historians. If the appearance of writing marks civilization, then we can study the history of Shang Dynasty in Oracle Bone Inscriptions, which is more than 3,500 years ago. It's just what we used to call 5,000 years of civilization. Japan is similar. Most of the early emperors only left their names, which could not be verified. They should have been invented by later generations. So it is not surprising that Japan claims to have a history of 3000 years.