Most people look at a map of Romania and think that the country as you see it now on a map has been exactly like that since its unification as a country. However, part of what we see today really was added to Romania after the end of World War I.
Most notably, Hungary, or the Kingdom of Hungary which was a part of the Austrian Empire, had Transylvania as a part of its territory. The land was large, and during the later years of the Austrian Empire, it was home to a lot of Germans whom the Austrians assumed would support them in times of both war and peace.
defensive positions and castles. This also now increases the tourism in Romania.
However, at the time of the Kingdom of Hungary Transylvania was a part of it, and there are many maps that illustrate that information. The maps of the Kingdom of Hungary including Transylvania often show it in its most eastern part. By 1867, the Austrian Empire and the Kingdom of Hungary merged to become the dual monarchy.
all written in history books, which most people have read.