You could look at papers about that to understand what changed.
Although anecdotally New Zealanders drink wayyyy more than Americans (so maybe hard to compare).
The state with the highest consumption in 2016 was New Hampshire, with a total alcohol consumed per capita: 4.76 gallons (18 litres).
Wow.
Comes from the following writeup for NZers:
From the domestic figures released by Statistics New Zealand, in the year 2017 [7]:
476 million litres of alcoholic drinks were available for domestic consumption: 289 million litres of beer 111 million litres of wine 77 million litres of spirits and spirit-based drinks
By volume, we drink almost three-times as much beer than wine. However, by alcohol content or standard drinks, 12.6 million litres of pure alcohol comes from beer, 11.5 million litres from wine, and 10 million litres from spirits. This totals 34.2 million litres of pure alcohol per year, or 8.8 litres per person aged over 15 years. On average, this means that every New Zealander drinks almost 2 standard drinks per day. However, in reality, we know that rather than New Zealanders drinking small amounts daily, around half of all alcohol in New Zealand is consumed in heavy drinking sessions.
Wouldn't this just move student drinking from college to highschool, not reduce overall student drinking? I don't think it's a good idea to having the driving and drinking age be the same. I'm sure lots of parents of teenagers would be very upset if their children could legally drink.
Seems to me if you treat your kid with respect and guide them they can be responsible adults.
Also mind you that the legal smoking age in the US is 18 and pretty much everyone agrees that it is much worse than drinking.