As you are well aware, this card delivers "a Shipment of Native Warriors from each different allied tribe."
To test the effectiveness of this card, and thus how to maximise its usefulness, i started a game against a sandbox AI and tried the following things. The results are interesting.
The map is British Colombia (a Custom Map) with 2 Cree and 2 Iroquois Settlements, played with a level 13 French civ in the Colonial age.
1 TP at an Iroquois Settlement yields 6 Tomahawks and 0 Mantlets
2 TP at two Iroquois Settlements yields 6 Tomahawks and 0 Mantlets
1 TP at a Cree Settlement yields 5 Trackers and 0 Cree Cdb
1 TP at an Iroquois Settlement and 2 Cree yields 6 Tomahawks, 0 Mantlet, 5 Cree Trackers and 0 Cree Cdb.
1 TP at an Iroquois Settlement, with 8 Tomahawks already built (max cap) yields 6 Tomahawks and 0 Mantlets
1 TP at a Cree Settlement, with 13 Cree Trackers already built (max cap) yields 5 Trackers and 0 Cree Cdb.
As such it can be inferred that there is a specific number of units that are sent for each native tribe, regardless of how many TPs you have of that tribe, regardless of how many units are already fielded, regardless of population etc.
So, the Native American Treaties card will send you:
6 Iroquois Tomahawks (6*100 = 600 resources) and/or
5 Cree Trackers (5*120 = 600 res).
on the British Columbia map. Does anyone have the figures for all the tribes for all maps? Does it depend on which map? I will be able to try them all out eventually and add them too the list, i just figured that if anyone knew already then that would be fluffy.
Perhaps the most interesting feature of this card, is that
The Optimist believes that we live in the best possible world. The Pesimist believes this to be true.