(2) "due to strategic and economic reasons". This is not fully correct, there were also ethnic reasons (in the eastern part), and I see absolutely no point to discuss such issues in this article. The only important point is that the border was not identical with the ethnic line. 

(3) "fully Hungarian". The "fully" is not correct, either. Most of the area, actually 100% of it (correct me if I am wrong), was not and is not "fully" Hungarian. The area had mixed Slovak-Hungarian-Roma-Jewish population.