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Yes, you do have a potential claim to the land via adverse possession. Your "possession" of the land can be based on the fence-line. You believed everything inside the fence was yours and you claimed that property as your own property. Moreover, you have had such possession for more than the required 10-year period.
Here is an article that discussed adverse possession in MO in a bit more detail:
IF he erects a fence, you could claim it is trespass. However, if the legal survey shows that his land's legal description includes part of what you claim to have owned (via the fence line), then you would need to file a court action to quiet title to that land via the theory of adverse possession. A real estate attorney would be needed.
IF you successfully establish title to that land (assuming that a survey shows the fence line is not placed correctly), then you would be able to prevent his trespass on your property.
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I appreciate your help. Joyce
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