As millions of Americans are having problems paying their mortgages, so too are some Atlantic City casinos. Trump Entertainment Resorts became the second casino operator to say it would not make a scheduled loan payment while it tries to work out new terms with its lenders. Last month, Resorts Atlantic City did the same thing, and more could follow. It’s the latest proof that Atlantic City’s casinos, once thought to be recession-proof, are subject to the same financial pressures affecting the rest of America.