For the best states of ice climbing....
unfortunately Alberta isn't a US state since it would probably blow everything else out of the water, but I love Canmore.
otherwise I'd say
a) Colorado- its fairly extensive with a wide range of difficulties and a lot of test pieces. It seems like everywhere you turn it has stuff.
b) Vermont: while not as a large range as Colorado, Lake Willoughby is such a quality place, it would put at #2 in my books. Smugglers Notch while fun is a fairly small area. Has a bunch of good climbs but still smallish.
c) Montana and Wyoming (isn't it just one state anyways: sorry guys.... had to do that).
d) New Hamphshire: North Conway and Cannon has some pretty good stuff. North Conway has a bunch of moderates and a few test pieces and modern test pieces dot the state
e) New York: the Daks have a bunch of stuff. A lot of moderates and a few test pieces, both traditional and modern. The Catskills has some good stuff with the Devils Kitchen being very good. A lot of stuff around New Paltz seems to me to have access issues.
For learning to ice climb, the Daks in New York and North Conway are actually really good places. New Hampshire may actually before Monta/Wyoming in my books.... gotta think about it.
Washington is too fickle. I'd like to do some of the more alpine stuff but you really need to be a local since the temps are fickle. California: Lee Vining is ok but you REALLY can quickly out climb it. The stuff in Yosemite is really fickle and it collapses quickly. There is a scattering in the Sierras but not enough to make it a national class venue. Minnesota and Wisconsin: some natural stuff (Minnihaha Falls, along the North Shore and the Mississippi River) and some farmed stuff (Sand (something... its been a couple of years), Brickyards). The test pieces tend to be the farmed stuff. North Carolina (not joking): talk about fickle, but some test pieces do come in wheen the conditions warrent. Pennsylvania: it comes in but the state seems very anti-climbing with its laws. Some at the Delaware Water Gap which can be fickle but good although moderate. Arizona: seen some long lines form in Oak Creek Canyon but talk about fickle and much will require extensive dry tooling to get to. Paradise Forks occassionally forms up a line in Silver canyon. There are lines on the Navajo Reservation ( a 4 pitch thing being one) but is strictly off-limits.
Am I missing anything? I suppose Iowa with the frozen farm silo's puts a new spin on the term "farming ice" Don't know about Michigan or Nebraska since I haven't climbed there.