A more thorough explanation:

A land district is a territorial area created by the federal government that contains a U.S. land office responsible for managing the public lands within the district. It is a type of district used for administrative purposes.

An example of a land district is the Oregon and California Land District, which was created in 1850 to manage the public lands in Oregon and California. The land office within the district was responsible for surveying, selling, and distributing the public lands to settlers and other interested parties.

Another example is the Dakota Land District, which was created in 1861 to manage the public lands in the Dakota Territory. The land office within the district was responsible for surveying, selling, and distributing the public lands to settlers and other interested parties.

These examples illustrate how land districts were used by the federal government to manage the public lands within a specific territorial area. The land office within the district was responsible for surveying, selling, and distributing the public lands to settlers and other interested parties, which helped to promote westward expansion and settlement.