Eat_Up_Martha
Prince
The absence of data from so many countries indicates that it's probably not something universal like demographic change, resources, gdp, etc. I think Keli's on to something with the international agreements.
Some treaty of which the 'States and the USSR were founding members, with other countries signing on later? I'm tempted to say some sort of 'Nuclear Weapons Treaty,' but it doesn't seem to fit.
Some treaty of which the 'States and the USSR were founding members, with other countries signing on later? I'm tempted to say some sort of 'Nuclear Weapons Treaty,' but it doesn't seem to fit.