Cross border examples of collaboration

[Americalex]

Snowstorm aid: Hydro-Québec sends 200 workers to United States
http://montrealgazette.com/news/snowsto ... ted-states

Right now there's this big ass blizzard hitting the North Eastern United states, but I know of many other instances of such spontaneous collaboration going both ways. Back in the Montreal ice storm of the late 90s, we got tons of help from you guys it was really welcome. Then there are the other examples such as help with the california fires, etc. A place to catalog and perhaps measure some of the extend of this phenomenon.