Answer:
Step-by-step explanation:
The main difference between the grasshoppers in North America today and the Rocky Mountain locusts of the 1800s is that the Rocky Mountain locusts are now extinct, while grasshoppers continue to exist and can still cause damage to crops.
The Rocky Mountain locust was a species of locust that was once abundant in western North America. In the late 1800s, these locusts caused devastating crop damage as they swarmed across the Great Plains. However, by the early 1900s, the species had disappeared, and it is now extinct.
Today, various species of grasshoppers continue to exist in North America, and they can still cause significant damage to crops in some areas. However, they are not known to swarm in the same way that the Rocky Mountain locusts did. Additionally, measures such as insecticides and other pest control methods are used to mitigate the damage caused by grasshoppers.