Vasco Nunez de Balboa crossed from the Atlantic Ocean to the Pacific Ocean using a land route that he was the first European to find. Why was his discovery of the Isthmus of Panama so important?

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.

the correct answer is

d) rocket launcher

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.