The US emergency hotline is 911 because of the September 11th terrorist attacks.

The statement is false. The emergency hotline number 911 was established long before the September 11th terrorist attacks. The digit combination 9-1-1 was chosen as the emergency number in the United States due to its simplicity and ease of remembering. It was first introduced in 1968 and became widely adopted across the country over the following years. The September 11th attacks did not influence the selection of this number.