Austro-Hungarian Empire
The Austro-Hungarian Empire collapsed after World War I, and the subsequent Treaty of Trianon established Hungary's current borders, resulting in the loss of 71% of its territory, 58% of its population, and 32% of ethnic Hungarians.
Hi!
It would be a problem because they could have different opinions on life, including government opinions. If you shoved them together, even more conflict would happen.
Hope this helps!
2a : a sudden, radical, or complete change. b : a fundamental change in political organization especially : the overthrow or renunciation of one government or ruler and the substitution of another by the governed. c : activity or movement designed to effect fundamental changes in the socioeconomic situation.