Coccinella novemnotata, nine-spotted lady beetle, aka "C9"

New York State Gardeners: You can help re-introduce our state insect! See Links below.

A decade ago, shortly after I launched this blog, I wrote the following:
[Coccinella] novemnotata was once common. How did New York State get to have a once-native-but-no-longer-resident state insect?
Not just common; C. novemnotata, or C9 for short, was once the most common lady beetle in the eastern U.S.