There are 321,368,864 people in the United States of America.
Assuming you only surround yourself with your countrymen, you are likely to get to know -- really get to know -- at most 1000 Americans in your lifetime.
Those 1000 people are likely to come from your socioeconomic background.
You will die knowing .00003 percent of your countrymen.
This is why you didn't see Trump coming.