Why does the Amazon Basin have low population density ?

Answer in below

Explanation:

Amazon basin is sparsely populated because it's dense rain forest. Rain forests aren't a very friendly environment for human habitation, i.e. lack of fresh water, dangerous animals, lack of solid ground, lack of dry shelter, skeeters, dense trees, limited fuel and food sources, and difficult transportation.

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.