Question

This shows a timeline from 1820-1920.

A timeline from 1820 to 1920 shows the following events: 1821, Greece gained independence; 1862, Serbia won independence; 1871, Germany annexed Alsace-Lorraine; 1900, A naval arms race began between Germany and Britain; 1914-1918, World War 1.

For how many years were tensions between European nations growing before WWI finally broke out?

ninety years
fifty years
forty-five years
fifteen years

Answer 1

Ninety years.

The timeline’s earliest event is 1821 and World War I began in 1914, so tensions grew for about 1914 − 1821 = 93 years (closest choice: ninety years).