Technically no; an Electronic Travel Authorization in addition to your US passport is sufficient (and significantly cheaper, at $20 AUS vs. $130 AUS for a visa).
However, you do have to have either the ETA or a visa. The passport alone is NOT sufficient.
Yes. Well, sort of. It's actually a little more complicated than that.
US citizens must have both a valid passport (from the US government) and authorization (from the Australian government) in order to enter Australia.
The authorization could take the form of a visa. But you probably don't want one, because it's significantly less expensive to get an Electronic Travel Authorization instead ($130 AUS for a visa vs. $20 AUS for the ETA).
They need to register for ETA either online themselves or through their travel agency couple of days prior to their departure.
No. You need a passport if you just plan on going on a short 90-day vacation. However, to remain their longer, you need a visa.
Yes because that person is traveling from a different country and needs permission to come to this country.
No, but you do need a valid passport.
Yes. You can come on business visa for business purposed or tourist visa for vacation. Contact ASC migration Visas for consultation and visa processing services. We help UK and European people to secure an Australian visa.
Yes, but you need a visa. (US citizens also need a visa for Australia. In fact, everyone except citizens of Australia and New Zealand needs a visa for Australia.)
If you are from a country whose citizens need a visa to enter the US, then you should apply for a visa at the nearest American embassy or Consulate General in Australia.
If you are not an Australian citizen or permanent resident you need a visa to be in Australia.
yes but u need a american/canadian visa yes but u need a american/canadian visa yes but u need a american/canadian visa yes but u need a american/canadian visa yes but u need a american/canadian visa yes but u need a american/canadian visa
yes. I need a visa to attend a training in Australia.
Yes you will need a visa to leave the airport.
Yes, all west Africans need a visa to visit Australia
yes, you do need a visa. If Germany is part of the EU than you need a Schengen Visa. If they are not, than you need a Visa from Germany.
yes
Yes