1: Why the vietnam war was so hard to fight. The war in Vietnam was difficult to fight due to the fact that the terrain was so harsh that it made the americans struggle to survive. There were 58,209 American deaths in the Vietnam war. 10,875 of them were not combat related.
2: Although a military loss, the Tet Offensive was a stunning propaganda victory for the communists. In fact, it is often credited with turning the war in their favor. The South Vietnamese lost morale as Viet Cong guerrillas infiltrated rural areas formerly held by the government.
To my knowledge, the correct answer among all of the given choices is C.) Steam. If I'm not mistaken, this was the time that more trains came into use.
I hope this is the answer you were looking for and that it helps!! :)
An absoulute monarch because i asked my teacher this a while ago.