I think this year and last year’s absence of people of color in the acting categories are outliers, not a trend. It’ the first time in more than a decade that an African-American hasn’t been nominated or won.

For most of the last 10-12 years. there’s always been an African-American nominee in one of the acting categories. Here’s a chart showing the nominations. There’s also links on the bottom for Hispanic and Asian-American actors.