As president of the united states, ronald reagan accomplished all of the following except: he end the vietnam war. he had a jocular spirit that calmed the nation after the attempt on his life. he end the cold war. he was an actor in hollywood's golden age.

I believe the answer is: He was an actor in Hollywood's golden age.
It's true that Ronald Reagan gained his popularity from starring in several Hollywood's film.
But all of that happened before Ronald Reagan became the president of United States. So, we can't say that it's his accomplishment as a president.

It allowed for things to be produced much more quickly and efficiently