embryodead
Caliph
Militaristic: Militaristic civs get a discount on this improvement, if it is a wonder, may trigger golden ages if all traits are met in combination with other wonders.
Industrious: Industrious civs get a discount on this improvement, if it is a wonder, may trigger golden ages if all traits are met in combination with other wonders.
Expansionist: Expansionist civs get a discount on this improvement, if it is a wonder, may trigger golden ages if all traits are met in combination with other wonders.
Scientific: Scientific civs get a discount on this improvement, if it is a wonder, may trigger golden ages if all traits are met in combination with other wonders.
Religious: Religious civs get a discount on this improvement, if it is a wonder, may trigger golden ages if all traits are met in combination with other wonders.
Commercial: Commercial civs get a discount on this improvement, if it is a wonder, may trigger golden ages if all traits are met in combination with other wonders.
Agricultural: Agricultural civs get a discount on this improvement, if it is a wonder, may trigger golden ages if all traits are met in combination with other wonders.
Seafaring: Seafaring civs get a discount on this improvement, if it is a wonder, may trigger golden ages if all traits are met in combination with other wonders.
It doesn't work that way. Namely, Industrious, Expansionist and Commercial flags do not give any discounts on improvements. Commercial flag determines whether the improvement is paid for by the "Pays maintenance for Trade Installation" wonder. Industrious and Expansionist flags on improvements have no effect that I know of.
Other than that , good job