內戰

內戰（Civil War），是由於一個國家的意識形態分歧所造成的國家分裂，並因此引發兩個獨立國家之間的戰爭，每個交戰國的目的都是完全吞併另一個交戰國。只要條件滿足，遊戲中的任何國家都可能因為彼此之間意識形態的相互牴觸，而觸發內戰。

西班牙內戰期間的西班牙

引發內戰

內戰可能基於某種非政府主流意識形態的多數支持而發生。如果一個國家目前的某種非政府主流意識形態的支持率變得過高，那麼他們將會要求改革政府。如果玩家無視或拒絕改革政府，內戰爆發的機率就會增加。某種日益增長的意識形態的政黨也有可能會發動政變，從而實現和平過渡，而不是引發內戰。

民意和政府顧問影響

一個國家可以通過選擇相應的政治顧問來影響其本國的意識形態的支持率，這將導致他們在選擇政府內部支持政變或民眾支持之間做出選擇，從而加快意識形態的支持率增長速度。儘管選擇民眾支持並非不可能導致政變的發生，但確實增加了政變發生前內戰事件觸發的幾率。當宣傳某種意識形態的政治顧問很活躍時，將偶爾會出發一些影響該國意識形態支持率的事件，或者增加某些民族精神，這將加快意識形態的轉變。

內戰也可能由外國企圖發動的政變引發。為此，一個國家必須提供 200 政治點數（每天0.5點）和步兵裝備。其所需的步兵裝備數量似乎與目標國家的核心人口有關。這個國家的人口越多，一個國家為內戰做準備就必須提供更多的步兵裝備。

內戰爆發後，該國將會分裂為兩個獨立的國家。給予一方的領土數量取決於主導該國的意識形態的支持率。交戰雙方，在內戰爆發後將立即彼此進入戰爭狀態，為自己的國家而戰。一旦內戰爆發，內戰將演變為一場正常的戰爭，某一方勝利點的多少將最終決定雙方的最終去向。唯一的區別是，在內戰中勝利一方所佔領的領土沒有佔領法案可供選擇，因為已經成為該國的核心領土。

分裂國家

內戰爆發後，根據預先設定的事件或交戰雙方意識形態的支持率，原先國家的軍隊將被分為兩部分。例如， 法國內戰雙方的比例是80％和20％， 蘇維埃聯盟內戰雙方的比例可以是82％和18％，70％和30％或50％和50％ ，其根據相應的情況拆分。

訓練中的陸軍師，海軍艦艇，空軍，儲存的裝備等也將按照百分比劃分。內戰中的兩國都繼承了所有已完成和進行中的科技。

交戰雙方被認為是不平等的，其中一個被認為是原始國家，另一個被認為是分裂國家。即使原來的國家具有不同的意識形態，但它的原始國家也會保留其原國家Tag，而分裂國家將會獲得一個新的國家Tag（例如德國（法西斯主義）點出「反對希特拉」國策時，由於奧古斯特•馮•馬肯森的「德意志軍政府」（中立主義）被視為原始國家，而希特拉的德意志國（法西斯主義）被視為分裂國家，所以德國tag（GER）被給予德意志軍政府，而德意志國則被給予一個新的國家tag）。

原始國家國家保留所有僱用的政治顧問，設計企業和理論家以及陸軍和海軍的將領。它還保留了所有積累的政治點數，陸軍/海軍/空軍經驗和未使用的科研加成；而分裂國家則一無所獲。

影響正在進行的內戰

內戰可以在許多方面受到外國勢力的影響，其中最值得注意的兩個是派遣志願軍和起草租借法案。

內戰爆發後，為反叛軍提供步兵裝備的國家可以通過借租提供額外的裝備，從而提供進一步的支持。一個國家除了提供諸如步兵裝備之類的基本裝備外，還可以選擇為反叛軍提供諸如坦克或火炮之類的先進裝備。這可以使反叛軍更有效地增強其軍事力量，從而使他們比對手更有優勢。

派遣志願軍是影響內戰進程的另一種方式，也可以用於在沒有主動加入戰爭的情況下獲得戰鬥經驗。為了使一個國家能夠派遣志願軍在內戰中幫助一方，派遣國必須與目標方保持和平（儘管不一定是對立的一方），並且不得加入其陣營。除此之外，派遣國必須部署足夠的陸軍師來派遣志願軍。

可以派遣的陸軍師的數量比是20：1，即每20個師可派遣1個師作為志願軍（向下取整，因此19個師或更少，將意味着無法派遣志願軍）。例如，176個現役師意味着可派遣8個師，而181個師則意味着9個師可以被用作志願軍。請注意，只有1個營的一個師與擁有25個營的一個師是一樣的計算方式；派遣國必須至少擁有30個師的基數才能派遣志願軍。此外，目標國家的每20個省份中必須要有一個師。參見：戰爭#志願軍

預先設定的內戰

有些內戰通常是在歷史上發生的，因此，目前西班牙內戰是預先設定內戰的唯一的例子。在這種情況下，國家的領土劃分是基於歷史情況的。這些內戰雖然有預先設定，但也可能受到外國勢力影響或通過派遣志願軍和起草租借法案從而進行干預。

戰略

如果您選擇的話，您可以將內戰納入您的軍事戰略指正。一個國家可以選擇在另一個國家發動內戰，以在入侵之前削弱它們。例如， 德意志國在 蘇維埃聯盟發動內戰，以在入侵前削弱該國。

但是，您也應該牢記，如果一個外國正在加入內戰的一方作戰，由於他們是獨立的國家，因此在另一方投降後，您無法對投降的一方提出任何要求。這意味着一旦和平會議開始，您將無法對您佔領的任何領土提出任何要求。 However, one should be mindful that if a break-away state is fighting a civil war and its opponents are taken out by a foreign power, the break-away state will retain control of its initial territory while the foreign powers will only be able to make demands on the nation they targeted, due to them being separate entities. This means you will not be able to make any demands on territory controlled by the rebels once the peace conference starts, meaning that starting a civil war to safeguard an invasion turns the conquest into a two-stage affair. Invading and defeating the target nation first, then invading and defeating the rebels after that.

If, on the other hand, one needs to trigger a civil war within their own country for reasons such as changing ideology (either through focuses or decisions), then there are two ways that you can easily win a civil war.

• If one is in charge of a small country (i.e., Greece, Bulgaria): train a single cavalry or motorized unit, and disband all other units. Deploy the unit and have it take all the victory points. While it is possible that the AI will train units by that point, it will not stop you from winning with this strategy as long as you keep on moving the cavalry/motorized unit.
• If one is in charge of a medium/large country (i.e., Germany, France): Get ahold of some army exp (through fighting in a war, exercising your troops, lend-lease, or sending an attache), and use that to design a template with a single artillery unit (anti-tank or anti-air will work just fine if you wish to use those instead). Train multiple copies of that unit, disband your entire army, and deploy the trained units at the start of the civil war. After your forces are split, change the divisions you kept to a different template. Because the AI will never change the template, this will make their army incredibly weak, and also give you a large number of units (which is helpful if you happen to have a civil war where, in addition to splitting the existing military, both sides will spawn new units).

In the case of the German Civil War, there are several additional strategies one can use to make it easier:

• If one sends all the equipment they have in a lend-lease to another nation that is at war a day before the war fires (either the Spanish Civil War or the Sino-Chinese War), and cancels the lend-lease after the war starts, the player will have all their equipment.
• If one conquers either Poland or Czechoslovakia beforehand (the former is very easy; the latter is harder, as it is guaranteed by France and Romania), the borders will not adjust and the Nazis will not take any Polish/Czech territory; as such, the Nazis will be forced to use the troops they spawned to take the unoccupied lands, and leave the borders near where the Landstrumregiments you start with spawn unprotected. If you spawn units in Poland or Czechoslovakia, they can keep the Nazi Landstrumregiments occupied while you use your Landstrumregiments to secure the victory points.

In the case of the American Civil War, the strategies differ depending on if one goes fascist or communist, as this will drastically impact the borders.

• If one is attempting to have the US become communist, the 13 states that broke away during the first civil war (Texas, Arkansas, Louisiana, Tennessee, Mississippi, Alabama, Georgia, Florida, South Carolina, North Carolina and Virginia) will break away; if one does not complete "Guarantee the American Dream" before hand, they will also lose the Midwest. As such, it is recommended that one beeline for said focus. Fortunately, you will not have your forces split when this war begins, so if you position your troops on the borders of the states that will break away, it will be very easy to move downwards and defeat them. Deploy some cavalry (5 divisions should be plenty) near Texas to secure the oil supplies - the capital can vary (sometimes it can be Richmond, VA; sometimes it can be Mobile, Alabama), but deploying 5 additional cavalry closest to where the capital is can help as well (if you train 2 sets of 5 divisions but don't deploy them, you should be fine). Use your navy to ensure naval superiority on the East Coast and stop naval invasions.
• The war to become fascist is much harder. Preparations beforehand can include converting the military factories in New England and the West Coast to Civilian Factories and taking the focus "Recruit the Free Corps" can help you deal with infantry losses. Taking "Work With the Bund" will prevent the Midwest from breaking free.

機制 

事件與決議

事件 • 決議