After the defeat of russia, japan focused on the expansion of its empire, beginning with
a.)seizing manchuria and eventually annexing it.
b.)seizing the korean peninsula and eventually annexing it.
c.)seizing the philippines as a protectorate.
d.)seizing the island of formosa as a protectorate.

A.) Seizing Manchuria and eventually annexing it.

Explanation:

Japan invaded Manchuria in 1931 and established the state of Manchukuo without any declaration of war. Manchuria was important for oil, rubber, and lumber. This event was one of the most important events that led to the outbreak of WWII because it showed the desire for expansion of the Japanese Empire.

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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