For yours truly, of course, no objectivity here. (1)
I pick as the marking moment of 2019 the burning down of Notre Dame in Paris. Why? Because it was infinitely more than a Church going down in flames, it was a hit on one of the main symbols of Western civilization. Period.
On the right the newspaper cover that is my "cover of the year", by Liberation, a progressive newspaper that was able to put aside any religious content to convey all the meaning on the moment. Notre Drame means our drama. A truly national drama in France.
Other marking moments.