Abstract: The Treaty of Trianon was signed after the World war 1st had ended with Hungary on June 4th, 1920 [ ]. According to the treaty; "the Allied and Associated Governments affirm and Hungary accepts the responsibility of Hungary and her allies for causing the loss and damage to which the Allied and the Associated Governments and their nationals have been subjected as a consequence of the war imposed upon them by the aggression of Austria-Hungary and her allies." The treaty divided Hungary and Austria as a separate nation from each other as its legal recognition through two separate treaties, Trianon is for Hungarian peace and the Treaty of St. Germain is for Austria. The Treaty of Trianon was the symbol of Hungarian losses through which it lost an estimated 75 percentages of its territory. The objective of the paper is about socio-economic-global analysis of the treaty in post-1920 Hungary. The outcome is to know its impact and mistreatment on Hungarian civilization that weakened Hungarian ethnical identity. Books and academic journals are informational sources as a methodological process of the paper. The feature question is how did the treaty impact on Hungarian diaspora? The future activity is to expand the paper as an academic analysis and to spread among the new generation through further academic research.