The nam viet empire developed differently from other southeast asian cultures, because for a long period of time, they were controlled and influenced by

india.

japan.

china.

indonesia.

Japan.

Explanation:

The Nam Viet Empire was a puppet state of the Japanese Empire that existed during 1945. It had a short existence, since it coincided with the end of World War II and the surrender of Japan.

After the Japanese took full control of French Indochina in March 1945, they weighed the idea for the establishment of puppet states in the former colonial territory. This idea came partly from the theoretical approaches of the so-called Co-prosperity Sphere of Greater East Asia, a large community of Asian states that would be built around Japan and in which it would be the center of it. Its creation, however, was made too late in World War II to have any influence.

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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.