Why do you think Fillmore emphasized that U. S. steamships at the time could travel to California to Japan in eighteen days.

Fillmore emphasized that U.S. steamships at the time could travel from California to Japan in eighteen days is to persuade Emperor of Japan to open trade between the US and Japan.

Explanation:

In 1853, President Millard Fillmore wrote a letter to Emperor of Japan to persuade him to open trade between the US and Japan. The reason for sending the letter to Emperor Japan was to break the 'seclusion policy' of Japan and enable the trade to the Western World.

When Fillmore emphasized the fact that the U.S. steamships at the time could travel from California to Japan in eighteen days is to persuade Japanese emperor to open trade between the US and Japan and break the seclusion policy.

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