To be honest, I don't know what the purpose of the Migration Categorization thing is, but I have seen it talked about so I thought I would try and use it. However, I have failed miserably and reached the level of frustration where if someone can't tell me what is wrong with this code snippet, I'm going to bag the whole effort.
{{CategoryInfoBox Migration|fromCountry=Holy Roman Empire|fromEntity=Electoral Palatinate|toCountry=Colonial America|toEntity=Province of Pennsylvania}}
I tried the German language versions of the first two. I started out with British Colonial America, but that didn't seem to do any good. I got rid of all spaces and carriage returns. Nothing I do works.