As an author of several prophecy books including two on Nostradamus prophecies, and another on biblical and other prophetic clues that the world as we know it ends in 2019 - I will admit up front - I don't think Nostradamus clearly said anything specific for 2019.
Yes, I do think he saw some future events - but most are described very vaguely. The most impressive hits were the fall of the Soviet Union in 1991 - which I think he nailed to the exact day - and the general theme of escalating war for 27 years between Islam in the East and Christianity in the West, probably from 2001-2028.
But other interpreters disagree - and suggest economic collapse, war, alien disclosure, the end of the Trump presidency,earthquakes and POLE SHIFT, and many other dramatic events in 2019. I do expect some of these things in 2019, and I do think Nostradamus wrote about many of these things (not all of them for 2019...) but without further commentary:
[youtube https://www.youtube.com/watch?v=dUDAMOSf_K0&w=853&h=480]