There is the problem of cancelling out one another's forces among the states.

国家之间存在着力量相互抵消的问题。

《新英汉大辞典》

Her campaign increased public awareness of the problem and prompted over 300 cities and several states to consider restrictions on cell phone use.

她的竞选活动提高了公众对这一问题的意识，促使300多个城市和几个州考虑对手机的使用设限。

youdao

The environmental approach hypothesizes that states appear in certain environmental settings, settings which have a severe population problem or a shortage of agricultural land.

环境法假设国家是在特定的环境中出现的，这些环境存在严重的人口问题或农业用地短缺。

youdao

The group met to develop a quality improvement plan for dealing with the problem in the United States.

VOA: special.2009.10.26

And obesity is a huge problem in the United States, especially in the African american community and other minority communities.

在美国,肥胖症是一个严重的问题,尤其在非裔美国人和,其它少数民族群体中

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

I started thinking, you know what, the reason why in the United States we have such a problem,

你知道我开始想什么了吗，我在想为什么在美国我们会出现如此的问题，

发挥创造力的瞬间 - SpeakingMax英语口语达人

Two recent newspaper stories underscored a problem several states are experiencing--stagnant or falling populations.

FORBES: Fact and Comment

One problem with states taking these matters into their own hands is that their decisions affect the standards for the entire nation.

FORBES: California's Proposition 37: An Impending "Natural" Disaster?

Uranium 235 is the key material in starting a nuclear reaction, and its acquisition is the main problem facing states which want to go nuclear.

BBC: Nuclear threat casts global shadow