The phrase "after its ratification" is correct and usable in written English.
You can use it to refer to a point in time following the formal approval or confirmation of a document, agreement, or treaty.
Example: "The new policy will take effect after its ratification by the governing body."
Alternatives: "following its ratification" or "subsequent to its ratification".
Centuries after its ratification, it is again under scrutiny as events pertaining to the 2016 election, and more specifically, Donald Trump's campaign, have raised questions about its power and limitations – especially when it comes to the freedoms of speech and press.
Why or why not? –Should state legislatures be asked to ratify the E.R.A. twenty-one years after its ratification deadline has passed?
Following the ensuing Sonderbund War, Kern joined with Henri Druey of Vaud in drafting a new federal constitution (1848) and, after its ratification, served as president of the Federal Supreme Court (Bundesgericht).
Two years after its ratification in 1964, the U.S. Supreme Court, invoking the Fourteenth Amendment's equal protection clause, in Harper v. Virginia Board of Electors, extended the prohibition of poll taxes to state elections.
NATO's operations in Afghanistan, Libya, Kosovo and in the Mediterranean Sea and the Indian Ocean all demonstrate that, more than 60 years after its ratification, the Washington Treaty remains relevant — an essential guarantor of peace and security.
After its ratification of the Thirteenth Amendment in November 1865, the South Carolina legislature immediately began to legislate Black Codes.
The Russians are expected to say, in commentary to be released after ratification, that it does.
Long after the ratification of the First Amendment, it remained an open question whether religious freedom included irreligious freedom.
Its first modern version appeared in the federal tax code in 1916, three years after the ratification of the 16th Amendment, which authorized the federal income tax.
