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

Here is Why You Need An Adapter

The outlet and plug type used in Hong Kong is G 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

Hong Kong

In Hong Kong, outlets of type G are in use.

Type G