The main reason why we cannot drill a hole to the Core is

See the explanation

Explanation:

At the inner core, you'd have to drill through solid iron. This would be especially difficult because there's near-zero gravity at the core and there it is super heat ness leverl that no-human can survive the heat of that core and many research are still under-work.

the first phase of the government’s plan for settlement was building the transcontinental railroad. the railroad provided a way to bring settlers and manufactured goods west and ship their agricultural and mining produce east. the transcontinental railroad was an essential artery for rapid development of the frontier.

the second phase of the government’s plan was a liberal land distribution policy that made it possible for many people to homestead. with these two key elements—transportation and cheap land—the government rapidly achieved its goal of persuading people to move west, settle on farms, and push back the frontier.