This is about my experience studying history. One and half month ago I joined a community about a history. I borrowed a book about this subject from a library. I have started to read it. It is so exciting. But I am sometimes very surprised when I learn something new about historical events. Because people who had been actively participating in this events weren't angels. They killed, betrayed, deceived, bribed. In general, they committed sins in the flesh before it they killed their own fathers and brothers. However, when you look at historical events from the future you can understand that these cruel action led to the creation of big and strong states. This aspect is so amazing. When I watch videos or read books about the history I constantly came across with the following phrase that we cannot judge those people by our today morality and our nowadays definitions. It is so true that it is so hard to understand those people from our reality. I am not in those historical events. I don't know how would be better to do if I was in those historical moments. Our president said: "if we had a time machine, and if we were in the past, and if we wanted to change historical events, we would have the same present as well as now. But, the consequences would be others. If I heard this statement two or three years ago I would disagree with him. However, life changed, I changed. In my today's opinion that he is right. We cannot change the past in any case. Therefore, we don't need a time machine.