Which of these was the largest and most constant issue facing the United States during the era of "Manifest Destiny?"

Clearing out the Native Americans and Native people living there. Also actually getting out into the land was a struggle because it was really far away and you had to ride on horse back

Explanation:

monarchy doesn’t have to have the hereditary element. there have been elective monarchies in the past where you choose your king-for-life and when he dies elect someone else for the job.

answer: this is because archeologists keep finding artefacts and ancient ruins dated more than 10000 to 15000 years, date around scientists said humans discovered language; which is at least mysterious as scientists always have said that is necessary to have a language to have architecture and some basic maths.

explanation: brainlest