Hi, are you also a only child?
I am not an only child. I have one sibling. Being an only child is relatively uncommon.
I agree.My family is small.
Small families are very common now. After World War II, family size shrank considerably. 
That is because of the cost of life in the USA
That's correct. The Great Depression followed by WWII had a huge impact on family size.
and don't forget, more women started getting in the work force
Having small families is occurring all over the world. China mandated the "one-child policy".    
that is to extreme in my opinion, for the USA i mean.
The policy was very restrictive. Unless a family had a daughter first, they would be only allowed one child.