I'll second this comment. Though not a professional genealogist, I am the family historian. Once you move more than 3-4 generations back you will exceed the scope of family lore and need external information to help you figure our where you come from.
For example, family lore held that my great-grandfather (GGF) immigrated from Wales. However, according to the US Census, it was his FATHER that immigrated. His mother came from Ohio. Once I knew that I was able to find my GGGF and that between 1900 (are you a US citizen = no) and 1910 (are you a US citizen = yes) something important changed. From that I was able to track down his citizenship application and find the town where he was born. Now I've jumped the pond and am working to find his parents. Fun times!
All of this started because the US Census asked several critical historical questions such as place of birth for you and your parents, parents names, age, marital status, citizenship, and occupation.
The fact that we are no longer asking these questions, whether for fear of offending or political correctness, is a travesty to future generations.
"When the going gets tough, the tough get empirical." -- Jon Carroll