Mannerheim's Finland takes inspiration from both the nationalistic idea; Greater Finland (Suur-Suomi) and Mannerheim's ambitions and desire to intervene in the Russian Civil War during and after the Finnish Civil War on the side of the White Movement.
Notice: This timeline is currently going through a revamp.
In our timeline, Carl Gustaf Emil Mannerheim, commander-in-chief of the White Finnish Army during the Finnish Civil War was met with constant opposition from the Provisional Government with regards to his ambitions for his armies aims and ambitions to intervene in the Civil War in Russia. Ultimately, he stood down as Commander-in-Chief upon internal victory in Finland and vacated in Sweden.
His royal audience with Gustav V of Sweden conferred him a Grand Cross of the Order of the Sword which, after some retort, was explained to be decorated as the representative of all Finns and not solely to Mannerheim. This only increased his standing with his men. He distanced himself with the Germans while meeting with the British, American and French diplomats in Stockholm, a man forced to accept German assistance during the Civil War. He stated he could not in all conscience bear his country's continued drift into German influence which further popularised himself amongst the Allies. Sir Esmé Howard stated, "It is fairly clear that he is our friend, and his influence in Finland will probably revive in time."
A pro-German government in Finland continued down the path of tying closer relations with the Germans due to their severe lack of Foreign presence about The Great Wars advancements. Both Paasikivi and Svinhufvud, the Prime Minister and Regent respectively, begged Mannerheim to make use of his international fame in London and Paris to assure the Allies that the monarchy situation was an unfortunate necessity to prevent both Russian and Swedish intrigue. Initially, he declined this official position and went a private citizen. He was able to persuade the Americans to lift the trade embargo and pleaded with the French.
With the governments failure to establish a stable head-of-state, Svinhufvud}} resigned on 10 December along with Paasikivi's cabinet. The Peace conference took place and it was deemed the right time for a regent to fight Finland's corner who would command respect from the doubting foreign powers. He reached London upon the war's completion and was able to secure a loose promise of grain relief from Lord Cecil and let both Britain and France believe that negotiations with Frederick Charles had broken off. Mannerheim's return to Finland just before Christmas 1918 coincided with the arrival of the first shipment of grain relief from the Allies. He was hailed a conquering hero.
In this timeline, by 1919 the new government reached the final stages of negotiating Finland's new constitution. Mannerhein disapproved many of it's points of order because of the lack of Finnish intervention in the Russian Civil War. He refused to approve the constitution, dissolved parliament and confirmed a constitution with no parliament to argue one way or the other. He then began rallying and preparing to intervene in the Russian Civil War, empowering his military rule during the preparation period. Not only did he have the majority of the White Guard at his disposal but the backing of most conservatives and Swedish-speakers.
What would happen now that Mannerheim could operate almost unopposed as head-of-state of Finland? Only time would tell.