Social Studies For Young Children

I am taking Social Studies for Young Children for this semester. First, I thought it is an easy subject. However, it is not. Hmm. My lecturer gives pretty standard assignments. But, there are sooooo many aspects that we should dig about.
Frankly, I do not really aware about this subject. After I have gone through 8 classess, I notice that social studies is connected to every subjects such as: Science and Language. Sometimes when you teach the children social studies, you also teach them about science.
From that I made my own conclusion that many schools do not have social studies in curriculum because it is related to other subjects. When the children learn Math, they also get a chance to learn social studies. For example: Time (Past, Present, Current)... When the children learn Language, they also get a chance to learn social studies. For example: Family. When the children learn science, they also get a chance to learn social studies. For example: Solar system.
When it comes to "Who is the founder of telephone?" and stuff like that, I am thinking that do the children ages 4-6 need to learn about this? Do they understand? Do they grasp the concept of founder?
Nevertheless, we as the teacher should prepared ourselves to teach the children about social studies.
Currently I am trying to read a social studies text book that my lecturer suggested to us. You know, preparing myself for exam ;)
GAMBATEH!