In the 1950s and early 1960s, sometimes magazines and newspapers seemed to spell it "Viet Nam". Later, as the war became a common and routine reporting event, the two names merged. Some of the old timers like President Johnson (LBJ) used to pronounce Vietnam as "Vet Nam".
the spelling
No, the spelling of "dilemna" has not been changed to "dilemma." "Dilemma" has always been the accepted spelling, whereas "dilemna" is an incorrect variation that some people mistakenly use.
The spelling was changed around about 1952 or 1953
Media coverage of wars changed from Vietnam for better.
It became a communist but united country,
Two things that have changed since the Vietnam era are communications and the cost of living.
The word "business" has not undergone a change in spelling. It has been consistently spelled as "business" throughout its usage, originating from the Old English word "bisignes" meaning "anxiety" or "care."
Because it changed what had been a simple guerrilla war in South Vietnam into an open conventional war in both South VN and North Vietnam. There was no open direct hostilities against NORTH Vietnam prior to the Tonkin Gulf.
The Vietnam war
WWII Generals took over, and Vietnam escalated into conventional warfare.
In addition to the spelling error, this question is illogical.
The correct spelling of the word is edited (changed, or revised).