In the mid-1800s, one result of manifest destiny was
a. the northern boundary of the united states was set at 54°40’.
b. the united states and great britain went to war in 1846.
c. the nation elected a president who was a member of the whig party.
d. the traditional american indian way of life was threatened

I believe the answer is: D. the traditional American Indian way of life was threatened

Manifest destiny was the belief held by settlers in 1800s, which make them see that their society was destined to expand their influence and control all region in north America. Because of this, they are willing to get rid of many American Indian and forced them to move to another region and threaten their way of life.

the use of email to replace slower surface mail.

it's lower nubia : ) good luck