Splash Mountain is based on Song of the South - an old Walt Disney film containing three animated segments based on the Uncle Remus stories and strung together by a live-action narrative in which the stories are told by the Uncle Remus character in Reconstruction-era Georgia.
The movie is controversial for several reasons - but perhaps chief among them is the depiction of the status of black sharecroppers in Georgia during reconstruction as relatively jovial and entirely willing workers on those plantations. This is not an incredibly accurate depiction of that kind of situation, and has attracted criticism. Not helping maters is the fact that the source material - the Uncle Remus stories - were written in an incredibly thick and stereotypical black accent.
An excerpt from one of those stories for example:>"I 'speck I done wo' out my welcome up at de big house," he said, after a while. "I mos' knows I is," he continued, setting himself resignedly in his deep-bottomed chair. "Kase de las' time I uz up dar, I had my eye on Miss Sally mighty nigh de whole blessid time, en w'en you see Miss Sally rustlin' 'roun' makin' lak she fixin' things up dar on de mantle-shelf, en bouncin' de cheers 'roun', en breshin' dus' whar dey ain't no dus', en flyin' 'roun' singin' sorter louder dan common, den I des knows sump'n' done gone en rile 'er."
I confess - I cannot decipher the text.