This is the first time in the history of the US that such a regulation has been issued at the federal level.
The White House said the decree was designed to " promote unity" and "encourage a common American culture for all citizens".
The decree also reils a regulation since President Bill Clinton in 2000, which requires federal agencies and government-funded organizations to provide language assistance to those with limited English proficiency.
The decree clearly states: "Since our Republic was founded, English has always been the national language. Important documents in American history, including the Declaration of Independence and the Constitution, were all written in English. Therefore, it is time to officially recognize English as the only language of the United States.
Having a common language is the foundation for a unified and strong society. A country is strengthened when citizens are free to exchange ideas in a common language.
When welcoming new Americans, policies to encourage learning and using English will help them consider the US as a common home and create conditions for them to realize the American Dream.
Speaking English not only opens up economic opportunities, but also helps immigrants integrate with the community, participate in national traditions and contribute to society. This decree also recognizes and honors the long tradition of multilingual citizens who have learned and passed down English through many generations.
To promote solidarity, nurture a common culture, ensure unity in government activities and facilitate the participation of citizens, the federal government needs to establish one - and only one - official language. Officially recognizing English not only helps simplify communication, but also strengthens national values, creating a more connected and effective society".
Although the federal government will no longer be required to provide multilingual services, agencies still have the flexibility to continue maintaining bilingual services if necessary.
Although English has always been considered the common language of the United States, no federal law has ever officially recognized English as the only language. More than 30 states have their own regulations on this, but all previous efforts to make English the official language at the federal level have failed.
According to the US Population Census data, there are currently more than 350 languages in use across the US. However, 78% of the population only speaks English at home, while 13.4% use Spanish - the second most common language. Other languages such as Chinese, Tagalog, Vietnamese, Arab, French, Korean and Russian have fewer users.