Tala
The currency used in Samoa is the Samoan Tala. (WST)
Samoa is a democratic nation.
If a family member from overseas wanted to send money to Samoa they would simply use a money transfer service that has offices in Samoa. The most common is Western Union as it services a large number of countries.
Tonga is. But Samoa is Bigger than Tonga.
Motor vehicles, motorbikes, buses, interisland ferries, planes, canoes, etc
No you cannot. The only legal tender accepted in Samoa is the Samoan Tala (WST). If you're travelling to Samoa, you'll have to exchange your money to their currency.
The kind of money used in japan is YEN.
English money
tuna
Danish Croner is what they use in Greenland for money
American Samoa is a territory of the United States and sends representatives to Washington.