1942 what is the background of the first day covers and stamps issued by the United States to commemorate the anti-Japanese war?

1942 On July 7th, in order to commemorate the 5th anniversary of the July 7th Anti-Japanese War in China and pay tribute to the indomitable anti-Japanese spirit of China soldiers and civilians, the US Postal Service issued a stamp commemorating the 5th anniversary of the Anti-Japanese War in China and a batch of first-day covers with the theme of the Anti-Japanese War in China on July 7th.1942.

This stamp is set on the map of China, including Taiwan Province Province, and printed with July? 7? 1937, the words "Anti-Japanese War and Founding of the People's Republic of China" are printed in Chinese under the English words, and there is July? 7? 1942。 On both sides of the stamp pattern are portraits of Lincoln and Sun Yat-sen, and his speech is printed under Lincoln's portrait. People.? By who? That? People. For what? That? People ",and under Sun Yat-sen's portrait is China's" nationality, civil rights and people's livelihood ". ?

This stamp is the first stamp with a central pattern composed of foreign characters in the history of the United States postal service, and the first stamp printed in Chinese in the United States. In order to ensure the accuracy of the Chinese characters on the stamp, the relevant departments and personnel who designed this stamp specially invited the staff of the Chinese Embassy in the United States for inspection and confirmation.