What happens in USA?

In America, since December 21, 2018 several federal offices are closed. It has already happened other times, even under the Obama administration, surely these interruptions that stop 25% of the federal departments, slow down the economy, since hundreds of thousands of workers do not receive the salary.
Investors need to worry? 
If you are an investor, you already know that your investment needs time, so a momentary perturbation does not have to worry, you probably do not need to make changes when events such as this occur.
An investor should read the stock market forecast.