Final answer:
The railroads nearly drove the passenger pigeon to extinction in the United States.
Step-by-step explanation:
The railroad industry in the United States had a significant impact on the decline of various animal species. One species that was driven near extinction by the railroads was the passenger pigeon. These birds once filled the skies of North America but were heavily hunted and lost their habitat due to the clearing of forests for farmland. The last living passenger pigeon died in 1914.
Learn more about passenger pigeon