Final answer:
The fence built by Betsy's neighbor onto her property without permission is termed as encroachment in property law, potentially leading to a legal dispute.
Step-by-step explanation:
When Betsy's neighbor built a fence that extends onto her property without permission, this fence could be referred to as an encroachment. Encroachment is a term utilized in property law that describes a situation where one party builds a structure, like a fence, which intrudes into or over a neighbor's boundary line.
This can lead to a dispute that might require legal resolution, possibly involving an easement or the removal of the encroaching structure.
Fences and their implications are often used as metaphors in literature and poetry, as seen in the provided excerpts, to discuss the broader social and personal issues surrounding boundaries and neighborly relations. However, in a straightforward legal context, the issue here is one of resolving property boundaries and rights.