1) No.
2) Shift-right click on an AI leader head, and you can choose from the missing civs. I think also Shift-D gives you a list of civs for diplomacy, but you can;t see the relationships.
R
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"Verily, thou art not paid for thy methods, but for thy results, by which meaneth thou shalt kill thine enemy by any means available before he killeth you." - Richard Marcinko