Why was the Supreme Court's ruling important in Gitlow v. New York with respect to due process?

Why was the case of Gitlow vs New York Important?

New York, 268 U.S. 652 (1925), was a landmark decision of the United States Supreme Court holding that the Fourteenth Amendment to the United States Constitution had extended the First Amendment's provisions protecting freedom of speech and freedom of the press to apply to the governments of U.S. states.

Explanation:

i think its provide for the common defense