What additional requirement was mandated for land grants under the Fourth Class Headrights?

The additional requirement mandated for land grants under the Fourth Class Headrights specifies that a land grant must include the cultivation and fencing of at least 10 acres. This provision aimed to promote the development and responsible use of land, ensuring that settlers not only acquired land but also actively improved and utilized it for agricultural purposes.

Establishing cultivation and fencing serves several vital functions. It encourages the establishment of a more organized and productive agricultural landscape, fostering economic growth in new settlements. It also enhances land security, as fenced areas are less susceptible to encroachment and disputes over property boundaries.

The other requirements listed in the choices would not align with the historical context of the Fourth Class Headrights. The requirement for irrigation, planting trees, or ensuring road access, while beneficial for certain agricultural practices, do not reflect the specific stipulations tied to the Fourth Class grants. This highlights the focus on direct agricultural productivity and land stewardship mandated by these grants.