How did the sinking of the Lusitania draw America into WWI?

you mess with our ships and or land and or islands, we take it as a declaration of war, and come drop bombs, and you dont want that.

Basically, by attacking things that embody our military, a country thinks it is strong enough to pick a fight and deal damage to us, so we engage in warfare

Explanation:

that

observing traffic laws in exchange for driving on the highway.