Since the beginning of the Green Revolution¹, no. The source of these conflicts are always ideological. Always. Ideology may come through religion or some other medium.
Countries don't go occupying land because they need crops or slaves anymore. Material is always cheaper to buy than to get from an occupation. The desire to annex some land is always for somebody's pet project, it doesn't make economic sense.
1 - In a very wide sense. Agriculture stopped being the bottleneck for human populations at some point in the 18th or early 19th centuries.
Airstrip one is disappointed.