I’m willing to bet at least some of your ancestors were farmers. Their livelihood, their ability to feed their children, to clothe themselves — it all depended on the earth.
And it depended on the type of earth. All soil is not created equal, and not all soil is used to grow the same things. The type of soil your ancestors had available to them and the climates they lived in dictated the crops that they could grow. People grew what they knew. If you knew how to grow wheat, and you picked up and moved to a new location, you would want to grow it in the next place that you lived.
When your ancestor was looking for new opportunities, this might drive where they migrated to. To gain insight into the direction they went you might want to look at a physiographic map. A physiographic map, shown above, tells you the kind of soil that you will find in a specific area. The Great Road (one of its many names), which many of our ancestors used to migrate from Pennsylvania to places south, follows the same lines as the bluish and purple land swaths that you see there.
Look at this physiographic map of Virginia. The solid lines define the different physiographic areas.
So if your ancestors were living on the coastal plains in the early 1830s, do you think they moved west or south?
Probably south. Moving west would require traversing mountains and changing climate and soil. Moving south requires a change, but it is a change that has fewer unknowns.
Do a Google search for physiographic maps for your state (for example, Pennsylvania physiographic maps). Every little bit of information that you can find about your ancestors makes you understand them that much better.
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