i'm on ready for making my secret suggest civs here, after my asian suggest civs, Mongolian, with the most difficult faction "Wonder Aging up" is canceled due to can't quite shine and unfit history:
my secret civs:
-> use european like ...
-> has unique villager: who can't gather all resources, only build a building (act as usa enterpretur)
-> the only way to gather resources is the unique building, named "supply depot", also this building can act as a house
-> no shipment or tech that send resources crates, instead, send resources directly
-> has "stockpile" bonus, which mean: instead of starting with resource crates, this civs has starting resources already in your inventory