After being granted permission to land in Japan, Sanger was required to sign the following statement. The original version, written in English, was not found; this document is a translation of a Japanese translation of the letter. Sanger then reshaped her lectures to focus on topics such as "War and Overpopulation."
Margaret Sanger to Kōsai Inoue
March 10, 1922
I hereby promise that during my visit to Japan I shall not give or deliver a public lecture treating with the subject of Birth Control without the consent or permission of the proper authorities.