Originally posted by jdrou
My first post. First, you might want to include an explicit term to show that event-based mods to manpower (Cantonments & New Land Claimed) are added to the base manpower before population effects are done.
Noted.
Second, your list of regions is still incomplete. From province.csv the regions and continents they are part of are: <SNIP>
Pacific. Thanks.
Third, I modified China in the G so they started with cities in Sarong, Wollongong, Kauai, and Sierra Madre. Modified province.csv so that they had 20 base manpower and some cities in Africa and Europe had 20 base manpower. Made event so China inherited those countries. All of the provinces outside of asia (as defined in province.csv) had 0.0 manpower. Moved capitol from Anhui to Shanghai, same thing. Exited game, modified province.csv so the provinces were in asia. They now give manpower. Continent does seem to make a difference for me. I can't explain your results to the contrary. (I am using v1.05).
I could reconstruct this with inheritance & nationalism. Will look into it when I find the time. I remember a comment in a recent patch as to provinces in the 'same adjacent area to the capital' always giving manpower, so will check to see if these 0.0 are tied to inheritance or somesuch.
EDIT: Not tied into inheritance.
EDIT: Nor to date. 1419 or 1800, same difference.
However, I just loaded an old, memorable, and unhacked Timurid/Mughal game in 1807 with capital Delhi (India/Asia), in which I got manpower from (amongst many other places) Roma, Novgorod, Svealand, and Zimbabwe. In other words manpower from places in the continents of Europe, Africa, and Asia, and again it was conspicious that alone of Europe the British Isles contributed 0 manpower, despite having high enough base manpower in several provinces. This precludes continent alone being the answer and is consistent with prior findings.
EDIT: This is driving me nuts. (Ok, nuttier, then).
1) The continent of a province (as defined in province.csv) has direct influence on whether manpower can be attained as illustrated by changing continent name for a province (jdrou's China example reproduced)
1a) It follows that the region alone isn't enough to determine whether manpower can be achieved, so that idea, though nice, will have to be scrapped. Yet another nice theory succesfully falsified.
2) The continent of a province is not enough, since
2a) It is possible to only get manpower from certain regions of a continent (Mughal example and Byzantium example)
2b) 2a) is not due to road access, since it is possible to get manpower across water in many example (like Indonesia)
3) The continent of the capital is not enough since moving a capital from the region of Central Europe to the British Isles (both in the continent of Europe) changed which provinces supplied manpower.
Conclusion:
Something fishy indeed. Surely nothing has been hardcoded to the tags... This investigation is funny.
EDIT: Not tags either, AARGGH!
Status:
Province manpower calculations not disproved. Plenty of evidence that the equation is correct for every province in which you can receive manpower. So tables also assumed correct bar typos.
Region only theory for province manpower attainability disproved. (Thanks, jdrou

)
Continent only theory for province manpower attainability disproved.
Capital's Continent location only theory for province manpower attainability disproved.