World War II involved a country.
World War II -LRB- often abbreviated to WWII or WW2 -RRB- , also known as the Second World War , was a global war that lasted from 1939 to 1945 , although related conflicts began earlier.
A world war , as it is commonly understood , is a large-scale war involving many of the countries of the world or many of the most powerful and populous ones.
