You Do Need power plug adapter while traveling from American Samoa to South Sudan.

Here is Why You Need An Adapter

The outlet and plug type used in South Sudan are C and D and in American Samoa are A, B, F and I. This is how they look like.

American Samoa

In American Samoa, outlets of type A, B, F and I are in use.

Type A

Type B

Type F

Type I

South Sudan

In South Sudan, outlets of type C and D are in use.

Type C

Type D