Why would a national speed limit be effective during oil crisis in 1973

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The National Maximum Speed Law (NMSL) in the United States was a provision of the Federal 1974 Emergency Highway Energy Conservation Act that prohibited speed limits higher than 55 miles per hour (90 km/h). It was drafted in response to oil price spikes and supply disruptions during the 1973 oil crisis.

The correct answer is: it shows that ancient humans hunted the now exinct creatures.