MOH is plenty on its own, it is a complete curriculum. There are several reasons people supplement. Some parents supplement to meet the needs of their children’s extreme interest levels. Others are striving to meet different learning styles of their children. Some homeschoolers are simply “curriculum junkies” (we have some on our staff!) who have trouble stopping at just one and not using everything that’s out there.
If you love MOH and wish you had a full curriculum that centers around your history study and uses MOH as a spine, take a look at our Illuminations curriculum.