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Water is the basic problem in the vast majority of expansive soil foundation problems. Specific constituents of certain soils tend to swell or shrink with variations in moisture. The extent of this movement varies from soil to soil.
Depending on where your Jefferson City, Missouri house was built, and how the contractor backfilled around the foundation or basement, will determine the stresses your home is under. Those soils highest in clay content are generally more susceptible to swelling or shrinkage while those lowest in clay content are the least affected. In some areas the movement is insignificant; in others, it is quite pronounced.
Again, with modern construction, one part of your house may sit on clay soil and the other on aggregate. This can cause major shifts and contractions.
You may also want to get a professional inspection and evaluation of your home's unique setting as you review this site for information about your own particular situation. That foundation professional may even go back to early geologic mapping to determine the original slope before that area was developed. In some extreme cases, core samples might need to be taken to see what material actually sits below your home.