Landed property was a key element of feudalism, and freed the owner for other tasks, such as government administration, military service, the practice of Law or religious practices.
In later times, the dominant role of landed estates as a basis of public service faded. Development of manufacturing and commerce created capitalist means of obtaining income, but ordinarily demanding the attention of the owner; at roughly the same time, governments began imposing taxes to fund government bureaus and the military so that people of talent could perform government services for salaries without need for the proceeds of ownership of farmland. Parts of the United States of America, typically New England and Pennsylvania, never had a landed aristocracy, so their armed forces and government agencies could never be organized on the basis of a landed aristocracy.