Answer:
genuinely would be the synonym.
heartily means to do something in a hearty, sincere manner, which is the same thing as being genuine.
Jim Crow laws were a collection of state and local statutes that legalized racial segregation.
Jim Crow laws were based on the theory of white supremacy and were a reaction to Reconstruction. In the depression-racked 1890s, racism appealed to whites who feared losing their jobs to blacks.