I need to answer the question, so could you give me an example of the question? I want to compare with your idea to answer the question.

What is an example of (just) one thing that could happen today in the United States, which would result in a decrease in the Supply (Curve) of a product that you are familiar with?

You should also specify a particular business firm (by name) that is a supplier in the Product Market, and identify (just) one specific good or service that they sell.

(Please note that the one thing that cannot cause the Supply for a product to change would be for the price of the product itself to change - this only changes the quantity supplied by business firms).