Which trail acted as a mail route that connected the West Coast to the eastern half of the United
States?

Oregon Trail

Explanation:

The Oregon Trail was a 2,000-mile, historic east-west wagon route and emigrant trail that connected the Missouri River to valleys in Oregon and locations in between. The eastern part of the trail spanned part of the future state of Kansas and nearly all of what are now the states of Nebraska and Wyoming.

in ray bradbury's short story "a sound of thunder", mr. eckels's fearfulness leads to drastic consequences for the rest of the world.

in the story, mr. eckels, who is a hunter, hires a time travel company to travel to the age of dinosaurs. although he is excited for the hunting expedition at the beginning, when they reach there and mr. eckels sees the tyrannosaurus, he feels frightened. as he is afraid of the tyrannosaurus, he steps off the path although he has been warned not to do it. by stepping off the path, the entire course of the future is affected: mr. eckart alters the future by stepping on a butterfly, which causes a new man to be elected president in the future. in that way, it is mr. eckart's fearfulness what triggers 'the butterfly effect' and what leads to drastic consequences for the rest of the world.

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