Here in the United States, minors aren't allowed in bars for even 1 hour per week! Is the difference here the "amount of authoritarianism," or simply the types

Here in the United States, minors aren't allowed in bars for even 1 hour per week! Is the difference here the "amount of authoritarianism," or simply the types of things each country believes are harmful enough for minors that they ought to be banned or restricted?