Can I file for wrongful termination if a company has no goals for my position and lets me go for poor performance?

A Texas employer can fire (demote, transfer, reduce the pay of) a Texas employee at any time for any reason or no reason with only 3 exceptions: 1) the employee has a contract which prohibits the action; 2) the action violates a state or federal statute (prohibitions on discrimination against race, sex, age, national origin, religion, disability, retaliation for reporting discrimination or retaliation for filing a workers compensation claim, filing a minimum wage or overtime claim - there are also some very specialized statutes regarding teachers, health care workers and nuclear power plant workers); and 3) the action violates a judge-made exception to the at-will employment doctrine - there are only 2 in Texas - refusal to commit a crime and in violation of a specific promise not to fire for a specific reason. Based on the facts you provided, the employer can legally fire you for "poor performance" even though that justification is or may prove to be untrue.  It is not uncommon for employers to make up reasons for termination, even if they don't need a reason at all.  If there are specific factors your question doesn't include (e.g. you are over 40 and the replacements are younger than 40; you are of one race and all of the replacements are of another; you recently reported violations of wage & hour laws or reported illegal discrimination), you should check with the EEOC at www.eeoc.gov. Good luck.