USA Historical City Directories
Genealogy research is essentially working backwards in time: From information supplied by living relatives and from data found in public records, you can easily compile a genealogical pedigree or yourself showing lines of descent extending from parent to child in successive generations.
With further genealogy research, you can examine related records of marriage and death, and records of land ownership, wills, immigration, and associated records of citizenship, naturalization, and military service. Combining these different genealogy data sources helps you to connect the dots and flush out a bigger picture of your family--showing connections between siblings and their children, for instance--thus creating a genealogical family history
