Cores represent the "stable" administrative zones of a nation. However, there is also some cultural cachet around defending the "homeland" of the nation, and this concept is sometimes blended in with cores. I suggest that we add a new concept of "heartland" on top of the coring system, which reflects these concepts.
Heartland Effects
In general, losing your heartland should be problematic for an empire, but it should also be more difficult than losing the periphery. Heartland is easier to develop (~ -10% dev cost) and has slightly lower unrest (~ -0.5% unrest). Finally, heartland is immune to the autonomy increase described below under "Non-Heartland and Autonomy". Note that these benefits are small, for design reasons elaborated below under the section "Adding Heartland"
Heartland UX
Heartland can be represented by a variant of the coring icons (perhaps with a bolded or double-line border). It should also be represented on the map views, likely through the political map view and possibly the fort map view (heartland mostly becomes relevant during war). On the map views, heartland would probably be easiest to represent by adding an overlay, either making the color shade slightly darker, or adding a heartland icon to the map.
Non-Heartland and Autonomy
When peripheral regions provide a significant portion of a nation's revenue, this generally gives them leverage to demand greater autonomy. Any cored, non-heartland province which contributes > 5% of the nations revenue will have a monthly autonomy gain equal to ((% of national income - current autonomy) / 60). Thus, over 60 months, the autonomy will rise to be equal to the percent of national income, barring other influences on autonomy.
Losing Heartland (Heartland in War)
The populace feels more national connection to the heartland - they defend it more strongly when threatened, and resent it more when lost or ceded to the enemy. When any heartland province is occupied, the outrage of the local populace increases their dedication to war, resulting in a (non-stacking) +5% land morale while the province is occupied.
However, loss of any heartland province in a peace settlement adds a (non-stacking, but extendable) +2% unrest national modifier for 15 years. A province ceded in a peace deal loses heartland status, becoming a normal core.
Adding Heartland
Cored provices become heartland over long association with the nation. Only same-culture, same religion provinces which have no seperatism are eligible to become heartland. Clicking the coring button on an eligible province will begin the process of upgrading to heartland, which costs 1 Diplomatic MP per month, and completes after a number of months equal to the current development.
It is intentional that the heartland bonuses are relatively low, and heartland status is difficult to obtain. Empires, especially expansionist empires, are expected to keep much of their territory as non-heartland provinces.
Heartland Effects
In general, losing your heartland should be problematic for an empire, but it should also be more difficult than losing the periphery. Heartland is easier to develop (~ -10% dev cost) and has slightly lower unrest (~ -0.5% unrest). Finally, heartland is immune to the autonomy increase described below under "Non-Heartland and Autonomy". Note that these benefits are small, for design reasons elaborated below under the section "Adding Heartland"
Heartland UX
Heartland can be represented by a variant of the coring icons (perhaps with a bolded or double-line border). It should also be represented on the map views, likely through the political map view and possibly the fort map view (heartland mostly becomes relevant during war). On the map views, heartland would probably be easiest to represent by adding an overlay, either making the color shade slightly darker, or adding a heartland icon to the map.
Non-Heartland and Autonomy
When peripheral regions provide a significant portion of a nation's revenue, this generally gives them leverage to demand greater autonomy. Any cored, non-heartland province which contributes > 5% of the nations revenue will have a monthly autonomy gain equal to ((% of national income - current autonomy) / 60). Thus, over 60 months, the autonomy will rise to be equal to the percent of national income, barring other influences on autonomy.
Losing Heartland (Heartland in War)
The populace feels more national connection to the heartland - they defend it more strongly when threatened, and resent it more when lost or ceded to the enemy. When any heartland province is occupied, the outrage of the local populace increases their dedication to war, resulting in a (non-stacking) +5% land morale while the province is occupied.
However, loss of any heartland province in a peace settlement adds a (non-stacking, but extendable) +2% unrest national modifier for 15 years. A province ceded in a peace deal loses heartland status, becoming a normal core.
Adding Heartland
Cored provices become heartland over long association with the nation. Only same-culture, same religion provinces which have no seperatism are eligible to become heartland. Clicking the coring button on an eligible province will begin the process of upgrading to heartland, which costs 1 Diplomatic MP per month, and completes after a number of months equal to the current development.
It is intentional that the heartland bonuses are relatively low, and heartland status is difficult to obtain. Empires, especially expansionist empires, are expected to keep much of their territory as non-heartland provinces.
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