美国人也太不诚实了吧? come on! You need to

learn how to say things potically right. read or recall your conversation, and you will find they have not promised you anything yet. They make it sound very attractive to you. People here in the US are much more professional than people in China, and they will make things politically right, and you will have no chance to complain/sue them. We have a lot to learn from them.