Treaty of Trianon in the context of "Hungarian Republic (1919–20)"

The Pannonian Basin, with the term Carpathian Basin being sometimes preferred in Hungarian literature, is a large, mainly lowland area in southeastern Central Europe, briefly described as a sedimentary basin. Under the geopolitically changed conditions created by World War I and the ensuing Treaty of Trianon, the geomorphological term Pannonian Plain was also used for roughly the same region, referring to the lowlands in the area occupied by the Pannonian Sea during the Pliocene. However, Hungarian geographers consider the term "Pannonian Plain" not only unhistorical but also topographically highly erroneous. Regarding the name as such, they are arguing in terms of ancient history, namely that the northern and eastern boundary line of the namesake Roman province of Pannonia was formed by the River Danube, thus the Great Hungarian Plain was not part of the original Pannonia province.

Hungarians, also known as Magyars, are an ethnic group native to Hungary (Hungarian: Magyarország), who share a common culture, language, history and ancestry. They also have a notable presence in former parts of the Kingdom of Hungary. The Hungarian language belongs to the Ugric branch of the Uralic language family, alongside the Khanty and Mansi languages.

There are an estimated 14.5 million ethnic Hungarians and their descendants worldwide, of whom 9.6 million live in today's Hungary. About 2 million Hungarians live in areas that were part of the Kingdom of Hungary before the Treaty of Trianon in 1920 and are now parts of Hungary's seven neighbouring countries, Slovakia, Ukraine, Romania, Serbia, Croatia, Slovenia, and Austria. In addition, significant groups of people with Hungarian ancestry live in various other parts of the world, most of them in the United States, Canada, Germany, France, the United Kingdom, Chile, Brazil, Australia, and Argentina, and therefore constitute the Hungarian diaspora (Hungarian: magyar diaszpóra).

Negotiation is a dialogue between two or more parties to resolve points of difference, gain an advantage for an individual or collective, or craft outcomes to satisfy various interests. The parties aspire to agree on matters of mutual interest. The agreement can be beneficial for all or some of the parties involved. The negotiators should establish their own needs and wants while also seeking to understand the wants and needs of others involved to increase their chances of closing deals, avoiding conflicts, forming relationships with other parties, or maximizing mutual gains. Distributive negotiations, or compromises, are conducted by putting forward a position and making concessions to achieve an agreement. The degree to which the negotiating parties trust each other to implement the negotiated solution is a major factor in determining the success of a negotiation.

People negotiate daily, often without considering it a negotiation. Negotiations may occur in organizations, including businesses, non-profits, and governments, as well as in sales and legal proceedings, and personal situations such as marriage, divorce, parenting, friendship, etc. Professional negotiators are often specialized. Examples of professional negotiators include union negotiators, leverage buyout negotiators, peace negotiators, and hostage negotiators. They may also work under other titles, such as diplomats, legislators, or arbitrators. Negotiations may also be conducted by algorithms or machines in what is known as automated negotiation. In automated negotiation, the participants and process have to be modeled correctly. Recent negotiation embraces complexity.

The Kingdom of Hungary, referred to retrospectively as the Regency, the Horthy era, the Horthy regime, and Horthyist Hungary, existed as a country from 1920 to 1946 under the rule of Miklós Horthy for the most of its existence, who officially represented the Hungarian monarchy after a period of revolutions and the counter-revolution as the Regent of Hungary. In reality there was no king, and attempts by King Charles IV to return to the throne shortly before his death were prevented by Horthy.

Horthy came to power after supressing the Hungarian Soviet Republic during the period of White Terror, installing an authoritarian political system relying on the traditional economic elites and bureaucracy. Hungary under Horthy was characterized by its conservative, nationalist, and fiercely anti-communist character; some historians have described this system as para-fascist. The government was based on an unstable alliance of conservatives and right-wingers; while conservatism was predominant in the 1920s, afterwards Horthy manoeuvered between conservatives and the radical right with fascist leanings. Foreign policy was characterized by revisionism — the total or partial revision of the Treaty of Trianon, which had seen Hungary lose over 70% of its historic territory along with over three million Hungarians, who mostly lived in the border territories outside the new borders of the kingdom, in the Kingdom of Romania and the newly created states of Czechoslovakia and the Kingdom of Serbs, Croats and Slovenes (in greatly enlarged Romania there also remained a significant Hungarian population in Székely Land). Republican Austria, the successor of the former other half of the dual monarchy also received some minor territory from Hungary. Thus the post-1918 kingdom can be described as a rump state. Hungary's interwar politics were dominated by a focus on the territorial losses suffered from this treaty, with the resentment continuing until the present. After a period of international isolation in the 1920s, it began maintaining ties with Fascist Italy and Nazi Germany.

The Treaty of Saint-Germain-en-Laye (French: Traité de Saint-Germain-en-Laye) was signed on 10 September 1919 by the victorious Allies of World War I on the one hand and by the Republic of German-Austria on the other. Like the Treaty of Trianon with Hungary and the Treaty of Versailles with the Weimar Republic, it contained the Covenant of the League of Nations and as a result was not ratified by the United States but was followed by the US–Austrian Peace Treaty of 1921.

The treaty signing ceremony took place at the Château de Saint-Germain-en-Laye.

The dissolution of Austria-Hungary was a major political event that occurred as a result of the growth of internal social contradictions and the separation of different parts of Austria-Hungary. The more immediate reasons for the collapse of the state were World War I, the worsening food crisis since late 1917, general starvation in Cisleithania during the winter of 1917–1918, the demands of Austria-Hungary's military alliance with the German Empire and its de facto subservience to the German High Command, and its conclusion of the Bread Peace of 9 February 1918 with Ukraine, resulting in uncontrollable civil unrest and nationalist secessionism. The Austro-Hungarian Empire had additionally been weakened over time by a widening gap between Hungarian and Austrian interests. Furthermore, a history of chronic overcommitment rooted in the 1815 Congress of Vienna in which Metternich pledged Austria to fulfill a role that necessitated unwavering Austrian strength and resulted in overextension. Upon this weakened foundation, additional stressors during World War I catalyzed the collapse of the empire. The 1917 October Revolution and the Wilsonian peace pronouncements from January 1918 onward encouraged socialism on the one hand, and nationalism on the other, or alternatively a combination of both tendencies, among all peoples of the Habsburg monarchy.

The remaining territories inhabited by divided peoples fell into the composition of existing or newly formed states. Legally, the collapse of the empire was formalized in the September 1919 Treaty of Saint-Germain-en-Laye with Austria, which also acted as a peace treaty after the First World War, and in the June 1920 Treaty of Trianon with Hungary. Later, additional territories were ceded to other countries.