Foodstuffs are not generally classed as strategic materials: although vital, they are treated separately.
Techniques for replacing strategic materials with ersatz substitutes have become highly important.
As well as depending upon strategic materials, warfare may be carried out with their specific goal in sight.
Japanese expansion in World War II targeted rubber crops and their plantation areas in particular.
Conflict between Germany and France has repeatedly focussed upon the iron and steel bulk resources of their border region.