What convinced Johann to move to America?
When Pastor Vogel told Johann about how much land they would have when they moved (which is 50 acres per person, altogether 450 acres) to America. If they stayed in Germany the Duke's cavalry will be arrested.
How did he feel about the decision?
When he grow the crops back in Germany he started to plant other things like Indian corn, fruit, and wheat (which became very valuable) so they planted more of it. He felt happy and proud to be a Pennsylvanian.