I was pretty much raised as an only child - how about you?
i have 1 sister. Throughout history, only children were relatively uncommon, so people would more commonly have more than 1 child
Well my parents had two children, but then they got divorced and I lived with my dad and my sister with my mom.
oh that must have been very hard, but there is a lot to benefit from being a single child im guessing,
Yes, to some extent - but now as adults, my sister and I really aren't that close so there are also bad things as well.  We decided to have more than one child so they wouldn't be alone.
 From around the middle of the 20th century, birth rates and average family sizes fell sharply, wich may be a fact in why there is so many single childs 
I guess once birth control became more readily available and farms no longer were family affairs, people just didn't have as many kids
Birth control has been used since ancient times in many different ways.