Planned homebirth is one way to give birth naturally. I have birthed both of my children at home in Latvia, but it is possible in the US (not all states legally), California especially as well. For my Latvian readers there is a new association I am involved in that deals with advancing homebirth and you can find out more about it here.
I will develop this site further with more evidence based information about the safety of homebirth, that is usually the most discussed issue regarding homebirth. The two books in the Pregnancy section of Books Recommended (by Aviva Romm and Pam England) both have a good section on homebirth.