The SS prefix stands for Steam Ship- it is not with respect to country.
QE-2 was built with steam turbines making her the SS QE-2.
She has since been converted to diesel, so I suppose technically she would be the MV Queen Elizabeth 2 now-
She was and remains the RMS QE-2.
The Olympic, Titanic, and Britannic were British flagged ships, but IMM was the holding company who owned White Star Line.
The majority share holder of IMM was J.P. Morgan, who was an American.
This is why the case is sometimes made that the ships were American owned.

I think S.S. Means Steamer Ship or something, so it's british

Yes but they said SS even from Britain so why was that. Should't they be american property, but still read, RMS Titanic. Or did the US gov change it for some reason.

once the life boats made it to america bell they became us property that's why the life bouts were called ss

quite indeed

i would like to hear sundance's and ryans77 view on this

quite

cool, damm u harland and wolf

Harland and wolf where arguably the biggest ship builders of that era. They dwarfed any american yards. Infact the British ships where always the biggest, much bigger than there rivals.

was white star line american

and even if they are why would they want to build the three ships in britain

I can see why people think it was a USA company to, I mean many British car companies such as Aston Martin, Jaguar etc are owned but the US giant ford. However because the cars are built here they are still classed as British. Same goes for ships

But they trio where registered as British ships, they where called on for British Military service (the remaining 2 that is). The wreck of Britannic is in Greece and is protected by the Greeks and the British, not the Americans.