There are two types of solitaires that have been proven seen in North America. The Townsend's Solitaire is the only native solitaire of these two and its habitat ranges from northern Alaska into Mexico. The Brown-backed Solitaire is a vagrant and is sometimes seen in the extreme southwestern border states of the US. Another possible solitaire that may be identified and seen one day, is the Cuban Solitaire, which as the name suggests is a Cuban endemic. It may show up in southern Florida, driven there by a storm or just a wayward vagrant.
The solitaires are members of the thrush family whose habitat is found mainly in forests. More likely to be seen up in conifers feeding on insects and berries. These birds will on occasion show up at birdfeeders in the south or even in residential backyards if there are winter berries available.
Avibase - the world bird database This site provides the user with a complete list of bird species, broken down per country, or in the example of the US or Canada, per state and province. Here, bird species names are available in other languages, a great asset to be used as a translation of foreign bird names.
ABA - American Birding Association This site represents an organization that maintains official records of all birds species that have been proven to have been seen inside the perimeters of the North American Continent and the surrounding bodies of water. Regular revised versions are posted to keep the bird list current at all times. This is the list used by all serious birders over their lifetime. You may be aware of the movie called the "Big Year". It was with this list that all the competing birders used in an attempt to set a new record as to how many bird species that could be seen by an individual birder in one calendar year.
I hope you will take advantage of these suggested websites. I have used each of them, in one way or another, throughout the years in my quest to better identify and understand our fine feathered friends.