Civilization II Wiki
The 1996 sequel — 21 civilizations, 51 units, 28 wonders, firepower and hitpoints, and the High Council.
Civilizations
Twenty-one playable civilizations, each with a male and female leader to choose from.
Units
All 51 units. Stats read Attack / Defense / Move; Civ II adds hitpoints and firepower on top.
Terrain
The eleven tile types every Civilization II map is built from, plus the rivers that run across them — what each yields in food, shields and trade, how it slows movement and shelters defenders, what Settlers can improve and what Engineers can transform it into.
Technologies
Civ II expands the tree to 89 advances ending in Future Technology. Highlights below — the advances new to Civ II are marked. Full tree being entered.
Wonders
All 28 Wonders of the World — seven of them new to Civilization II.
Governments
Seven governments — Fundamentalism joins the original six.
City Improvements
Civ II grows the building list substantially. Core improvements below — full list being entered.