"The President is of opinion that if Japan makes a treaty with the United States, all other foreign countries will make the same kind of a treaty, and Japan will be safe thereafter"

This quote by Townsend Harris recommends that the President thinks that if Japan participates in a treaty with the United States, other foreign countries will follow suit and also Japan will be protected. This suggests that the President thinks that the United States is a powerful and also influential nation, which other nations will agree to participate in a treaty with Japan if the United States does so initially. This can be seen as an indication of regard for the United States, as well as a recognition of its power and impact worldwide. It can additionally be viewed as an indicator of Japan's trust in the United States, and its determination to enter into a treaty with the United States in order to guarantee its own security.