What causes people to have little or no education in the usa in 2020?

Expensive higher-education that not everyone can afford.

Maybe their family make them continue the family business?

States Rights, and conservatives don't want minorities to be educated.

some people have learning disabilities and cant learn

They do, they just don't have a piece of paper to show for it. The only educated people who are smarter went to the top schools. The others are often shallow and know nothing outside of what they had to for school.

EDUCATION =INCOME IN USA 2020 2050

They would rather stay home than go to school.
They go to school but do not pay attention
The parents don't force the kids to go to school

It should be noted that many high schools graduate 18 year old young adults - but fail to teach them how to register to vote, open a bank account, balance a check book, or how to fill out a job application or write a job resume.  They don't know how to shop and buy the least expensive items, they have no clue about food and nutrition...….. the only skill the leave high school with is how to keep a seat warm.

Very sad.

Overall numbers dont mean anything, some are retired, some already in businesses, some farmers.  Overall is meaningless.