Thank you for trusting your question to JA today. I am a licensed attorney with over a decade of law practice and over 20 years of experience in the legal field. I’m happy to be of assistance.
Unfortunately, in this country if you do not have an employment contract that expressly states you can only be terminated for cause, you can legally be terminated at any time, with or without cause. This is called 'at will' employment and is the default employment status, absent a contract that takes you out of the status.
The only way then that this termination, in the absence of an employment contract (and they are very rare), would be illegal is if you can prove you were targeted based on a specific illegal basis, your race, religion, gender, age, disability or recent FMLA use. The fact that the customers like you is not legally relevant. The fact that the prior owner drank often is not legally relevant.
So, on these facts, without more evidence of discrimination, I don't see anything that you can do here beyond waiting to see how the employer intends to handle this matter.
If you have any further questions, please let me know. I invite follow up questions, so use REPLY for those. If you have no further questions then good luck going forward and please do not forget to rate my service with a top-three rating so that I receive credit for working with you today. Please rate me based on my service and not on your satisfaction with the law, which I am not in control of and I am just reporting to you. Also, feel free to request me in the future, if you have questions concerning a different matter.