Those were the biggies, the bottom of the list captures the origins of the EU and continues on to today. It's also a nice contrast for people that may claim that we are/were more successful under isolationist tendencies (actually, that cost us our American colonies, history's funny like that).
But they all happened at a time of regulated migration.
Clearly showing a regulated approch doesn't cause a detriment.
Sinxe we had unregulated migration there ahve been no "biggies"



similar to the ones that crushed the argument made in the Daesh thread a few weeks ago.