What other words are like "independence" in British English where you replace the 'a' with an 'e'?
- Anybody can ask a question
- Anybody can answer
- The best answers are voted up and rise to the top
I reject your premise that "independance" is the American spelling; it's the French one. Both in British and in American English, "independence" is spelled with an "e". (There's even a federal holiday.)
They are all misspellings (some more common than others), just as independance is. Source.