What trading country in the Pacific was the most important destination for the United States in the early 1900s?

China

Explanation:

The appeal of profits to be earned from the China trade served as the initial impetus to motivate U.S. citizens and officials to enter into the Pacific region.

- a.) african slaves and indentured servant’s

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the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.