What natural barrier forms
the western border of the
southern colonies

The Mississippi River.

Explanation:

The Mississippi River is the natural barrier that forms the western border of the Southern colonies.the southern colonies were,Virginia, Maryland, North Carolina, South Carolina and Georgia.

if you could provide the poem below, i'd be happy to you!

explanation:

you didn't give us the poem, or the title of the poem. but it is essential for you to give us that, otherwise we can not detect when the poem has a tonal shift!

your answer is c i hope that