Chronology

At review sessions I keep hearing myself describe certain dates as very important or useful to know. In the past I have had classes collaboratively create lists of the most important dates. Here is a list of mine:

c.1450

1492
1517
1555
1618-1648
1688/9
1776
1789
1815
1848
1914
1917
1939
1945
1968
1989


These 16 dates are heavily weighted toward political and diplomatic history. Use your sense of the century sheets to identify big themes and developments in the other categories in particular centuries. What makes these key dates? What other dates might you add? What long term developments or time periods belong in your chronological scheme of European History since 1450?  Post thoughts in comments.