breaking a non-compete

I am a resident in Kansas but worked for an employer in Arizona. I was terminated Dec. 2003 for downsizing/financial reasons. I was forced to sign a proprietary rights and non-compete agreement 19 months AFTER I began employment, with NO benefit, compensation or promotion. I have been in this industry for 19 years( all my career life) and feel that the company will try to enforce the non-compete aspect of the document signed if I work for a competitor, so far this is the only lead on a job that I have after 3 months of searching. The potential new employer is aware of this because I provided them a copy. The agreement covers all of the US and all of Europe, and Asia. These are the primary areas inwhich my industry works. The time period is for 15 months. I will be forced to go into bancruptcy if this is enforced. Do I have grounds for this to be found unenforceable? Thank you for this service, I have found it to be very useful.