
These buildings serve different purposes, from unlocking new units to increasing the region’s defenses. In Supremacy 1914, you can build multiple buildings in each province you control.

Armoured cars have 60% efficiency starting from 6 units, 20% efficiency starting from 15 units, 10% efficiency starting from 25 units, and no bonuses past 40.Heavy tanks have 50% efficiency starting from 5 units, 20% efficiency starting from 10 units, and no bonuses past 25 units.Tanks have 60% efficiency starting from 5 units, 30% efficiency starting from 10 units, and no bonuses past 25 units.Infantry have 30% efficiency starting from 5 units, 10% efficiency starting from 15 units, and no bonuses past 40 units.Artillery, railguns, battleships, submarines, balloons, fighters, light cruisers, and bombers have 100% unit efficiency until 50 units at that point, they receive no bonuses from any further units of that type.Units have different size factor penalties. This is known as size factor, and the key to building effective armies is to account for size factor when assembling your armies.


However, the more of a single unit type you add, the lower the stat bonus becomes per unit added. Usually, when you add a unit to a stack, that stack receives 100% of that unit’s stats.
