Which regions of present -day Vietnam were particularly dangerous for the French forces?

The Iron Triangle region had been dangerous for the French.

Explanation:

The viet war of independence was one of the bloodiness and rarely successful that some eastern power had fought against the Europeans for control of their land and ended up winning.

The region that is being talked of here is called the Iron Triangle and in the time of the war it was being controlled by Viet Minh.

The gorilla forces uses the treacherous terrain of the region to their advantage and had trained to be good fighters there which is not the case for the french who lost in there repeatedly.

increases in demand are shown by a shift to the right in the demand curve. this could be caused by a number of factors, including a rise in income, a rise in the price of a substitute or a fall in the price of a complement.

which the answer is:

b

a drastic rise in oil prices ended decades of postwar.