彼らの民族主義がその戦争の原因の一つだった。の英語

Their nationalism was one cause of the war.

Men who were bereft of reason conducted the war.

They are the so-called victims of war.

The war brought ruin to the country.

Ethnic conflicts are one of the immediate causes of this war.

They were born in a poor period during the war.

The war ravaged the country.

Rumors of war disquieted the people.

The war made the country poor.

Both nations entered into a war.

The war wasted the country.

The country was torn by war.

The country was dragged into the war.

The country was against war.

The people at large were against the war.

By this war, the nation awoke to its power.―（他動詞構文にすれば）―This war awakened the nation to its power.

They are at war with the country.

The national existence was staked on the war.

They had to endure great hardship during the war.

The country was wasted by war.

They are as it were victims of the war.

They are victims of the so-called war.

The war laid the country waste.

Prices were strictly regulated during the war.

The war resulted from a mistaken policy.

Many atrocities were committed during the war.

Japan was then at war.

The war involved the existence of the nation.

A chain of events led to the outbreak of the war.

As the war went on, defeatism spread across the nation.