He wrote a detailed memoir about his experience.
The open door policy was designed to open Japan to American trade and influence (The US was hungry for an imperial puppet).
I believe the answer is D.
A. Dividing power among 3 branches of five
The most commonly used phrase describing the growth of the American economy in the 1830s and 1840s was “Cotton<span> Is </span>King<span>.” We think of this slogan today as describing the plantation economy of the slavery states in the Deep </span>South<span>, which led to the creation of “the second Middle Passage.”</span>