In addition to the census population count, there are a number of special censuses: Slave, Industry & Manufacturing, Agriculture, Mortality, Social Statistics, Union Veteran and Widow, Defective, Dependent and Delinquent.
Be sure to look at several families before and after the family you are researching. These people are most likely the friends or family of your ancestor. Many lived in the same community very near each other.
X chromosome: One of the two sex chromosomes, X and Y. The X chromosome is passed down from mother to child. X is the sex chromosome that is present in both sexes, singly in males and doubly in females.
Death Records can be the least accurate records depending upon the knowledge of the person reporting the information about the deceased. How much do your children know about you?
When it comes to spelling variations, be creative. Often clerks and government officials were unable to correctly record the names given them by unschooled immigrants not familiar with languages used in their port of entry. The surname was written down as the official heard it and the immigrant accepted that as the official American rendering of his name.