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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 :

Answer:

90 yrs

Explanation:

The years were tensions between European nations growing before WWI finally broke out was ninety years Option(a) is correct.

What was European nations?

The European nations were known to be as that nations which was considered as that nation which was occupying the European continent.

European nation were known to be as the individual country considered together within in its political and social cause so it was around Ninety years of the tension.

Therefore Option(a) is correct.

Learn more about European nations here:

brainly.com/question/3387326

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