Answer:
They aged over time. They got older and changed a lot, they got lots of rings. Age changed them by changing the way the logs burned and etc.
Explanation:
1861 - Kentucky decides to side with Union in the Civil War after trying to remain neutral.
1875 - The first Kentucky Derby is held at Churchill Downs. 1904 to 1908 - The Black Patch Tobacco Wars take place in Kentucky.
1937 - The Ohio River floods causing extensive damage.
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