AHC/WI: How could Western Samoa become part of the US?

Says it in the title; how could Western Samoa become part of the US as well as the current part of the Samoan islands owned by the US?
 
From Wikipedia:

"The Second Samoan Civil War was a conflict that reached a head in 1898 when Germany, the United Kingdom, and the United States were locked in dispute over who should have control over the Samoa Islands. The Siege of Apia occurred during the Second Samoan Civil War in March 1899 at Apia. Samoan forces loyal to Prince Tanu were besieged by a larger force of Samoan rebels loyal to Mata'afa Iosefo. Supporting Prince Tanu were landing parties from four British and American warships. Over the course of several days of fighting, the Samoan rebels were defeated.

American and British warships shelled Apia on 15 March 1899; including the USS Philadelphia. Germany, the United Kingdom and the United States quickly resolved to end the hostilities and partitioned the island chain at the Tripartite Convention of 1899, signed at Washington on 2 December 1899 with ratifications exchanged on 16 February 1900."

So it seems like butterflying away the Second Samoan Civil War would make partition less likely.
 
What about the Americans taking it during WW1 from the Germans?

That would seem hard.

New Zealand took Samoa almost immediately, 29 August 1914, with the expeditionary force departing from our shores mid month. I think there was a German radio station that London wanted dealt with. NZ also rather wanted Samoa too.

Anyway, so by the time the US enters the War, we've held it for 3 years or so and whilst the US could probably demand it, it would be a point of contention that would be hard to resolve.
 
What about the Americans taking it during WW1 from the Germans?

Only if the US joins the war in 1914. All German colonies, excluding Tanganyika, were swiftly occupied by the Entente, including German Samoa, which was occupied by New Zealand in August 1914. After the war it became a LoN mandate and seeing how the American position of the whole League thing was, they can't get the mandate and outright annexation just isn't really possible in a post-WW1 environment.

EDIT: Ninja'd...
 
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