What effect, if any, did america’s entry into world war i have on the outcome of the war? why?

The Americans appeared in the final year of the war. The Germans hadd been fighting since 1914, and in 1918, we war-weary, mainly young kids or battle-tired veterans, and were then suddenly faced with a fit, healthy, and well-equipped Army in the US. Plus the physical size of the US nation, and the size of the Army that suddenly arrived to support the Allies was a huge morale blow to the Germans, and shortly after the Americans entered combat, Germans started surrendering in large numbers. 

When you've lived on practically starvation rations, lived in a muddy hole, probably been wounded, seen your friends killed around you, been terrified for your life nearly every day, and been eaten by lice and rats for over 3 years, a super-fit and huge army heading your way is going to make you want to give up.

If he breaks the law then he had to resign from his post and so he'll lose his/her powers.