Over the past few hours on Twitter I have irked by some simplistic or unthought-through invocations of history.
Just because something has not happened before during one particular (youngish) person's lifetime, doesn't make it a unique phenomenon in history. It is one that can probably even be discernable with other people's living memory (what about the 'New Poor' between the wars or the Great Depression?)
The 1890s/1910s were not a period of uncomplicated British Imperialistic confidence and triumphalism.
Just because a method of contraception exists, doesn't mean that everybody, everywhere, will have access to it, particularly if it's a pharmaceutical product, which will a) be subject to national or regional regulatory licensing systems as to whether it may be prescribed b) is under the control of the medical profession.