The phrase "a landmark declaration" is correct and usable in written English.
It can be used to refer to a significant or important statement or announcement, often in a legal, political, or social context.
Example: "The president's speech was hailed as a landmark declaration of human rights that would shape future policies."
Alternatives: "a historic statement" or "a pivotal announcement".
That is a landmark declaration.
But Carlin asked the Fisa court to set aside a landmark declaration by the second circuit court of appeals.
These proposals were echoed in a landmark declaration made in March by ministers of the Bali Process, a 45-country forum on people smuggling and human trafficking.
The Jerusalem meet concluded with a landmark declaration that Hindus worship 'one supreme being' and are not really idolatrous.
During the Pacific Island Forum, Australia, New Zealand and 13 Heads of State from other Pacific nations made a landmark declaration -- calling for the full phase-out of greenhouse gas pollution, acknowledging that current efforts to tackle climate change are insufficient.
Now, as the global health community marks Alma-Ata's 40th anniversary, many are calling for a return to the landmark declaration's ambitious vision.
The landmark declaration that the health secretary has a duty to promote a comprehensive health service will be retained.
Last October, the Vatican and the Lutheran World Federation signed a landmark joint declaration, saying they agreed on most major points of doctrine, though not all.
Among the Second Vatican Council's great documents was the landmark Declaration on the Relationship of the Church to Non-Christian Religions, usually called by its Latin name "Nostra Aetate" ("In Our Age").
This year we mark the 65th anniversary of that landmark declaration.
The landmark declaration adopted by the General Assembly on December 10 , 1948 reaffirms that "all human begins are born free and equal in dignity and rights" and "everyone is entitled to all rights and freedoms... without distinction of any kind, such as race, color, sex, language, and religion... birth or other status".
