New City Improvements:
- Allows irrigation to spread within city radius
City Improvement Changes:
- no longer adds production to river tiles, instead protects city and tiles in city radius from flood damage
- required to build metal tools and equipment for export, required to make swordsmen, etc.
- required to build rifles, machine guns, tanks, etc.
- Town Council
Religious and Cultural Buildings
- Scriptural Sanctuary (requires Temple, Monastery or Library)
- Religious Monument