What race issues was Senator Johnson likely referring to in California and in the South? Given who

supported the Treaty (see Doc C), why might he have made this argument?

Taking into account the statement above

"What race issues was Senator Johnson likely referring to in California and in the South? Given who supported the Treaty (see Doc C), why might he have made this argument?

The answer is: The Southern regions since they obtained the most percent of the votes in support of president Wilson referring too 90%.