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

Here is Why You Need An Adapter

The outlet and plug type used in El Salvador are A and B 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

El Salvador

In El Salvador, outlets of type A and B are in use.

Type A

Type B