What critical factor does the rectangular survey system simplify in land descriptions?

The rectangular survey system, also known as the Public Land Survey System (PLSS), was developed to simplify the process of land description and division in the United States. This system uses a grid-based approach to identify parcels of land through a series of townships and sections, making it much easier to pinpoint specific locations and boundaries.

Specifically, the correct answer highlights that this system primarily simplifies boundary lines for plotting land. It does so by defining land in terms of measurable and recognizable units, allowing for precise and standardized mapping of property. Each township is divided into sections, which are then further divided into smaller parcels, facilitating the identification and transfer of property ownership.

This clarity in boundary definition helps greatly in various contexts, such as real estate transactions, land use planning, and property taxation, ensuring that everyone understands the exact limits of a parcel. Other options like measurement of tax increments, identification of historical landmarks, and land lease agreements do not directly relate to the primary function of the rectangular survey system, which is focused on delineating land boundaries.