Go to nearest American embassy and they will help you.
Yes, US citizens need a visa to visit Argentina.
Yes, US citizens need a visa to visit Kazakhstan.
Yes, a Russian citizen can visit the US by obtaining a visa or participating in the Visa Waiver Program.
Yes, someone from Mexico can visit the US with a valid visa or through the Visa Waiver Program.
Yes, someone from Venezuela can visit the US with a valid visa or through the Visa Waiver Program.
Yes, US citizens need a visa to visit Saudi Arabia.
Yes, US citizens need a visa to visit South Africa.
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.
Yes, US citizens do not need a visa to visit Ireland for stays of up to 90 days.
Yes, US citizens need a visa to visit Malaysia for tourism or business purposes.
With a US visa, you can travel to the United States, but the specific countries you can visit will depend on the type of visa you have.
No you can get visa only once. Till your visa is valid you can visit multiple times