no . you don't need it.
Guam is a US Territory, and as such, just like any other US owned soil, a Visa is not required as long as you are a US citizen. Saipan also does not require a Visa to visit.
Saipan is considered part of the US for immigration/tourism purposes. If you are a United States citizen, therefore, you do not need a Visa as long as you show proof of US citizenship (i.e. US passport, army orders, etc). There are 37 additional countries the citizens of which do not need a visa for entry to Saipan. In addition, through a special Guam-CNMI Visa Waiver Program, citizens of China and Russia also do not need a visa to enter Saipan. If your country is not on the "no visa required" list, then to apply for a visa, you may apply at any US embassy near you.
No. If you've got a United Arab Emirates passport you don't need a visa to visit the US.
yes but it has to be an American visa.
no
No you can get visa only once. Till your visa is valid you can visit multiple times
Visa is not required
No, just a US passport.
No need for a visa, as the UK is a participant in the Visa Waiver Program.
If you are just going to visit him in the US, all you need is a visit visa (tourist visa) but if you are planning on making your home permanently there with him, he needs to apply for a K-3 spousal visa for you.
No, a visa is not necessary, as Japan is in the visa waiver program, but that would require an ESTA from you.