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

Here is Why You Need An Adapter

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

Ghana

In Ghana, outlets of type D and G are in use.

Type D

Type G

American Samoa

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

Type A

Type B

Type F

Type I