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

Here is Why You Need An Adapter

The outlet and plug type used in Liberia are A, B, C 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

Liberia

In Liberia, outlets of type A, B, C and F are in use.

Type A

Type B

Type C

Type F