Between 1951 and 1963, it was illegal in the country of Geronia to manufacture, sell, or transport any alcoholic beverages.
Conclusion (therefore)
The attempt to prevent alcohol use merely made people want and use alcohol more than they would have if it had not been forbidden.
Evidence
Between 1951 and 1963, Geronia made alcohol illegal.
The death rate from alcohol-related diseases was higher during the first 5 years of the period than during the five years prior to 1951.
Evaluate
The author is looking at this Curious Fact and wondering,
Her Explanation is that,
Goal
Any time we're weakening an Explain Curious Fact argument, we have two possible pressure points: 1. suggest an Alternate Explanation for the curious fact 2. make the Author's Explanation seem less plausible
So let's look for answers that give us a different way to explain why there were more alcohol deaths in 1951-1956 than there were in 1946-1951.
And let's look for answers that lower the plausibility that prohibition led to people drinking more than they otherwise would have.