In most cases unless its a necessity there really isn't If you only produce on good if that good crashes such as cars during the depression you cant benefit from being good. in a company you either need to monopolize or you need different sources of income cause if the thing your good at fails you have something to fall back on.
Answer:
The primary reason for why the US sent troops to Vietnam was to contain communism and stop its spread. This was part of the Domino theory.
The correct answer is D. Both India and China had conflicts before WWII, but new governments were formed after WWII.
B)it allowed for a quick escape from most southern imports
C)it provided a direct link to European allies and their imports
D)it made it difficult for the union to create blockades