You can sue almost anybody anywhere for anything. Whether you'll prevail on your claims is another question. What makes you think that such a lawsuit would prev

You can sue almost anybody anywhere for anything. Whether you'll prevail on your claims is another question. What makes you think that such a lawsuit would prevail? E.g. have you read amex's terms and did they agree there to arbitrate disputes unconditionally? Or is there a law you're aware of that requires them to?