<human>:  What is the maximum speed limit in the United States, by state?
<bot>: The maximum speed limit in the United States varies by state. Generally, the maximum speed limit on interstates is 70 mph, but states like Montana and Nevada have maximum speeds of 80 mph and 85 mph respectively. Some states, such as Texas and South Dakota, have maximum speed limits of 75 mph, while others like Virginia have maximum speed limits of 65 mph.