To the Congress of the United States:
I submit herewith a correspondence between the Secretary of State and Mr. Robert B. Van Valkenburgh, minister resident of the United States in Japan. It seems to show the importance of an amendment of the law of the United States prohibiting the cooly trade.
Andrew Johnson, Special Message Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/202795