When ronald reagan gave his first official speech as the republican presidential nominee in philadelphia, mississippi, his ringing endorsement of "states' rights" was intended to send what message to white southerners?

The message was about Conservative Republicans' opposition to federal civil rights legislation

He wanted to tell the conservative republicans from the south that the federal government would stop bothering them with new legislation and would increase the power of individual states which would enable them to introduce laws that they wanted and not that the federal government had been bothering them to introduce.