Which Of The Worlds Countries Have Never Been Conquered By Another Nation?

I think throughout history, most countries have been conquered by someone.  All of Europe has been conquered, though with changing borders and countries coming into and out of existence throughout history makes this hard to know (for instance, the area of Germany was at one point part of the Roman Empire--but did Germany exist prior to the existence of the Roman Empire or spring up afterwards?)  Nonetheless, Germany lost WWII and was therefore conquered and ruled over by the Allies afterwards.  Also, what is your definition of a country?  Is the Sioux (or other native American race) Nation a country?  Or the Incans, Mayans, etc. Of central and south America?  So, both north and south America have been conquered and ruled over.  Africa, too, I guess, as most of Africa was ruled by the European powers.

Scotland has never been conquered all though ruled by an english government.
Russia has never been conquered even though many attempts have been made, due to
the size of the country it has been able to fend off complete domination.
Every other country has been dominated by an opposing force at some time in history.

Afghanistan, china, and nepal

Germany was part of the Roman Empire, however at the time it was not called Germany and the "Germans" that took over the Roman Empire were actually from Nordic Heritage.

Since when?
In modern times, ie AD, and large countries (that excludes islands)? :P
I would say USSR, China, Iran

USSR (AKA Russia) has never been conquered in history...

Japan
China
Thailand

Actually the countries that have never been conquered are...
  Russia
  China
  Scotland
  Thailand

but I could be missing some I'm not sure but I'm certain the above countries have not been conquered.

No nation on Earth that has survived being utterly independent - that means either being conquered, or governed by another nation.
However, there are Nations that have never been conquered, though for some, it is a grey area.
If we rule out nations that were 'created', but never conquered - this would include most of the new world ie USA, Australia, Canada, most of South America.

So here is the list of Mother Nations (the old world) that have never been conquered, but may have been governed for a short period by a foreign entity. There are 3 nations. These are Scotland, Sweden and Thailand
- Scotland and Sweden have had foreign kings as head of states,
- parts of Thailand were under different rulers until it merged into the state we know today.

Some might say Russia, Japan, Arabia.
- Russia was conquered and dominated by the Mongol Empire for 200 years
- Japan was forced into 'unconditional surrender' (conquered) by the Allies in WW2
- Arabia was ruled by the Ottoman Empire for several centuries

Thats a loaded question... You need to define conquered and since when?

If i am not wrong, these are the countries:
- Scotland
- England
- USA (as it was discovered not conquered)
- Germany