Why did south vietnam experience a sharp economic decline after the american withdrawal?

What does the document of the birtish octopus is an uderlying cause of the world war 1

The establishment of columbia as the state capital was important because a) it was located in the heart of the upcountry. b) it was located in the heart of the low-country. c) it was already established as a vital industrial center. d) it represented a compromise location central to most citizens.

As a result of the germanic tribes sacking rome