He pronounced the country to be in a state of war.

他宣布全国进入战争状态。

《牛津词典》

They will be de facto in a state of war.

他们将会处于一场战争状态之中。

《柯林斯英汉双解大词典》

The two countries entered into a state of war.

这两个国家进入战备状态。

youdao

Therefore,to send troops to a state where federal officers had resigned such as South Carolina would be an act of war against the state.

VOA: special.2009.07.16

If you are known or believed to be willing to fight, you are in a state of war.

如果别人认为你很想去打斗，你就陷入了战争状态。

耶鲁公开课 - 政治哲学导论课程节选

Such a condition, a state of war, may mean a condition of open warfare, but not necessarily.

这样一种状态，战争状态，也许意味着公开的战争状态，但这也不是必须的。

耶鲁公开课 - 政治哲学导论课程节选

Both sides immediately placed their forces on a state of war-readiness but the situation was resolved.

CNN: Monday,

Another exception might be a limited action for limited purposes not calculated to create a state of war.

FORBES: It's Time for Congress To Vote On The Illegal War In Libya

International pressure had been applied to Macedonia's leaders not to destabilise the region by declaring a state of war.

CNN: Macedonia unity deal hits snag