Powershell script to create subfolder in all folders, but not create if existing

So I already have this:

ForEach($dir in (Get-ChildItem 'F:\Clients\myapp\utah-catholic\' | Where{$_.psiscontainer}))
{
    New-Item "$($dir.fullname)\History" -type directory | Out-Null
}
What I need to do is this same process, but ONLY create "History" folder if it does not currently exist.