system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is the middle class vanishing in the US?
gpt
A few reasons to consider:

1. Jobs that used to be associated with the middle class have largely moved overseas, and are likely not coming back.  There are no longer as many job opportunities for people without a high level of education.

2. There has been a trend whereby wealth is starting to accumulate at a faster pace for the top 10% of earners.  There is debate as to why this his happening.  Some people think it's because we are crushing small businesses, and other believe it's because the tax rate on the rich is too low.