why stock market is down today in usa?

What is the reason for stock market down?
A stock market decline, due to a recession or an exogenous event, can put many investing tenets, such as risk tolerance and diversification, to the test. If your reason is mistrust, it's important to remember that the market is cyclical and stocks going down is inevitable, but a downturn is temporary.
Full answer in: www.investopedia.com
Why is the US stock market down today?
The blue-chip Dow was pulled down by industrial and financial companies sensitive to economic growth, with Boeing Co and Goldman Sachs each down more than 2%.