Why did the US economy slow down?

The US economy experienced a slowdown that exceeded expectations. Contrary to what might be assumed, this deceleration was not due to a decrease in consumer spending by Americans. The article indicates that the reason for the economic slowdown lies elsewhere, implying that other factors are at play. However, the provided content does not specify what these other factors are. Therefore, while the slowdown is confirmed and consumer spending is ruled out as the cause, the specific "why" remains unaddressed in the given text.