( CNN) This has been one hell of a year. As a historian who invests much of his time analyzing past changes of our current situation, I can say that this year has been one for the record books. The topsy-turvy world that President Trump has created in Washington has left many chiefs spinning. On a daily basis, it has been hard to know what will come next. From the tweets to the Russia investigation to the tax cut, 2017 was unbelievable.

Here are five big ones.

Is political outrage over?