Question

If each country becomes democratic the world by itself become democratic

Answer 1

Yeah this statement is true because the world is ultimately made up of the 196 countries and if every country follows democracy then the world would be declared Democratic
But technically this would never happen because the whole world can't be control by 196 leaders one from each country which will lead to war and disputes nothing else than that

Answer 2

Answer:

A democratic decision always involves many persons, discussions and meeting. When a number of people put their heads together, they are able to point out possible mistakes in any decision. ... This reduces the chances of rash or irresponsible decisions. Thus, democracy improves the quality of decision making.....

hope it helps you