What's the difference between these two sentences?
What’s the difference in meaning between these two sentences? Or either of them doesn’t even make sense?
①We have learned these things because one historian after another has decided that there is an African-American past that the stereotype makes it difficult to see.
②We have learned these things because one historian after another has decided that there is an African-American past that the stereotype makes difficult to see.
I'd appreciate if you could answer this questions!

