The enmity between Austria and Serbia over _____ hastened the World War.

The emergence of _____ was one of the major developments in history.

When did the October Revolution take place?

Who is known as Vladimir Ilyich Ulyanov?

When did the First World War take place?

In which year peace conference was arranged in Paris?

When was the Treaty of St. Germain signed?

When did the Opium war take place?

When did the Pullman Strike occur? 

When was the Treaty of Sevres signed?