Donald Trump promised to make the country great again, implying that Americans would be happy by returning to a mythical past (that never existed). What has actually happened is that the level of worry and stress has risen as our problems persist -- and that is true of Whites, Blacks, and Hispanics.
The chart above reflects the results of a newly-released Gallup Poll -- done between June 1st of 2016 and June 30th of 2017 of a random national sample of 123,272 adults (with the margin of error for each group ranging between 0.6 and 2.0 points).
NOTE -- This poll was done before Donald Trump and Kim Jong-un got into their pissing contest. It is likely that has raised the worry and stress levels even higher.