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

Here is Why You Need An Adapter

The outlet and plug type used in Niger are C, D, E and F 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

Niger

In Niger, outlets of type C, D, E and F are in use.

Type C

Type D

Type E

Type F