Lisa,
I have Silver-spotted Skippers here too and don't know what they ate here last year because I didn't have anything planted for them at the time. This year I planted Scarlet Runner Bean and Hyacinth Bean to see if they like those.

As far as host plants for the others, this is what I have listed for them:

American Copper - Sheep Sorrel, Curly Dock

Spring Azure - Wild Black Cherry, Meadowsweet

Tiger Swallowtail - Wild Black Cherry, Tulip Poplar, Spicebush, Black Willow

Pearl Crescent - New England Asters

Cabbage White - Cabbage, Broccoli, Brussels Sprouts, Cauliflower, Nasturtium

I get confused when people say "American Painted Lady". I don't know if they mean American Lady or Painted Lady, so I will give you the info for both:

American Lady - Sweet Everlasting, Cudweed, Licorice Plant, Pearly Everlasting, Pussytoes

Painted Lady - High Mallow, Hollyhock, Cosmos, Plantain, Okra, Pearly Everlasting

I'm sure others will add to my list. I just started into butterflies last year.

Good luck, and it sounds like you're on your way. :)

Cathy

I don't know why amorpha fruiticosa would be banned in your area. My haven't spread at all, and the SSSs use them every year, as a matter of fact, I just saw one flitting around them the other day.
MissSherry

Black Locust is a nice looking tree, but the roots do send up new saplings.
The new trees are relatively easy to keep these under control with a herbicide, roundup or spade.

It grows so quickly, you could also probably keep it in a bush shape if you want.