Core Knowledge Sequence - click!
(Attribution: This work is based on an original work of the Core Knowledge© Foundation made available through licensing under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. This does not in any way imply that the Core Knowledge Foundation endorses the work.)
While the 4/5 Lab creates study guides for some of our social studies and science units, one of the best places to find an overview of topics taught is in the Core Knowledge Sequence. For 2018-19, go to the 4th grade section and scroll to the desired subject and unit.