Passport and airline ticket that's it. Before you land British authorities will have you fill out a form asking you how long you will be in the country, where you are going, and why you are there. It is pretty simple to do.
do you need a visa to travel to the uk
A US citizen does not need a visa to enter the UK.
no
No
money!
Yes .
yes you do.
yes
Yes.
The right to travel with a US passport is one benefit of being a citizen of the US. US citizens need a passport to travel to other countries.
Not if you are a US citizen. If you are a citizen of the country, you can travel to any place part of the country without a passport.
You need the passport of the country of which you are a citizen. You cannot have a US passport until you are a US citizen.
Yes, they do.
If you are a US citizen, you will need both a valid US passport and an Australian ETA visa to travel to Australia.