ajax18 wrote: People have gotten better access to birth control. Has it reduced the number of children in poverty? On the contrary, poverty among children has continued to rise. A growing number of women are having these children on purpose, bottom line
That's not really true. Poverty among children has risen significantly since the 2007 recession, but that's tied to specific poor economic conditions. Otherwise, what you are saying doesn't explain the trend well.
http://www.irp.wisc.edu/faqs/faq6.htm
More to the point, the general reproduction rate has significantly declined over recent decades, so fewer children are being born into poverty. It just so happens that this is a general decline, so it doesn't impact the relative rate. As far as the history of the rate goes, it massively declined in the 60's, plateaued in the 70's, increased moderately in the 80's, decreased again in the 90's, started slowly increasing in the 2000's, then shot up after the financial collapse. It's still beneath where it was prior to the 60's. The two main drivers of the trend seem to be political policy and economic conditions.