Racial Discrimination and Equal Pay Act violation at work

It's not clear that you're being discriminated against because of your race or national origin, as you've mentioned nothing about anyone ever making any comments about your race that would reveal discriminatory intent. You've come to some conclusions based on your perceptions of unfair and disparate treatment, but there could be non-discriminatory explanations. Maybe the caucasion lead-turned-manager had more experience than you, and moe tenure. Maybe that person was assigned to the same job you were (was "lead" without more pay) before getting a raise and a promotion. Maybe the title of "lead" means different things in different jobs.

Discrimination claims are very fact specific, so you're best off consulting an employment lawyer and disclosing everything you've observed and experienced at your workplace, so your claim can be properly evaluated.

Disclaimer: Please note that this answer does not constitute legal advice, and should not be relied on, since each state has different laws, each situation is fact specific, and it is impossible to evaluate a legal problem without a comprehensive consultation and review of all the facts and documents at issue. This answer does not create an attorney-client relationship.