IME, the flag of the card has zero input in this matter.
IIRC, usury varies from state to state, but *generally* under 33-1/3% APR is legal.
Read the fine print even closer.... if you default on one card (for any reason?: over limit, late, NSF/dishonored check, etc), there is a pretty good chance the rates will go up on other TOTALLY UNRELATED cards.