can you specify what "dn" is so we can get you the right answer?
The League of Nations was formed to unify many countries. It wasn't very efficient. The United Nations was essentially an improved version of the League of Nations.
The answer is the first one, crime statistics of youth in cities that have curfews. If crime rates are lower, the curfew most likely works.
McClellan discovered General Robert E. Lee's battle plan.
Obviously, infiltration and access to battle plans allow for the opponent to figure out what their opponent's plans are, thus giving McClellan the victory at Antietam.
Hope this helps!
