I'm not very familiar with German or Jewish history and need some help with my family tree. From the mid-1700 thru the 1600s a large part of my family whom I believe are Jewish and from all over Eastern Europe and Russia lived in Germany. They came from Poland, Jugoslavia, Russia, Slovinia, Austria, Hungary, Romania, everywhere. I can't trace them back further than the 1600s. Is there a reason a large population of my Jewish ancestry from so many different Eastern European countries would be in Germany at that same time marrying and having children? I would appreciate any help.