on the rural: the framers looked to Rome for study, and they also saw themselves as, among other things agrarians. In Rome, the rural areas outside of Rome extending into the Italian peninsula were found the landholdings of the various citizen classes, esp. the farmers. Notwithstanding the difference in scale when comparing the agriculture of then with that of now, the center of agriculture moved towards the midwest in the United States, and agricultural interests represented themselves through their allotment by geographic proportion. Needless to say, the economic cycle has long been divested of its agricultural-cycle roots, despite the importance of raw commodities trading. In Rome, the agrarian class was often directly involved with the military and so often actively intervened and controlled Roman political life and history. As for the United States, you will find the justification for a geographical construction of districts pertaining to political representation (a hot topic today) in Thomas Paine's "The Rights of Man".
The United States exceeded the agrarian economic cycle. The introduction of modern finance at the beginning of the century followed the development of the economy in the direction of domestic development and the continued investment of the government in infrasture followed since the Lincoln administration.
Today, the political relevace of the agriculture is not only in the geographic fundamentals, the wealth required to own and administer vast ranges of land, but the legal and scientific strategems. The object of altering nature is to alter the market. The same is true for the establishment of whatever necessary legal precedent, especially where it concerns the creation of new types of propogation. New types of legal contracts follow from the advantages that major agricultural interests have created for themselves through investing in these technologies. Individuals today may find themselves or in combination with others the advantages of persuing agricultural production especially for personal sustenanance. This may allow for a lowered food budget with the same or better nutritional advantages.
Certainly, the global population will increase in number as agriculture is developed geographically. The push from the left internationally should be for 1) indiginous/native land rights 2) also water rights and 3) protection from destruction of their personal and communal access to their natural inheritance. The means exists now politically and legally to meet these goals. There is no type of development that is not possible when the right investment conditions are created.