Employment Law Questions? Ask an Employment Lawyer.
Unless you have a contract, it is legal. Howevever, if they do so because of your age, race, or nationality it is illegal. same with gender.
Also, if they cut pay significantly, that is considered a termination without cause and a constructive termination. You can file for unemployment benefits on that basis.
I am in NY. Kindly let me know if that is fast and clear.
You can negotiate or file for benefits and look for anew position based on the material change/reduction in benefits.
Kindly let me know if that is clear.