Rice
It was never popular; it was unknown.
Chess
Tea.
Dot Kich (Cross Fire) & Audition Vietnam
noodles i think
Noodles are popular because that was the only food they could have
This depends on your purpose of tourism. North Vietnam is the most popular of the two destinations.
The U.S. feared that Vietnam would vote for a communist government.
There are very many popular dishes in Vietnam but I think this website will answer your question better than I can, the pictures showing the dishes are beautiful. http://vietnam.sawadee.com/food.htm
It was an issue which divided the US.
Nguyen