After World War I broke out in 1914 Page was so enthusiastically in favor of Britain during the period of American neutrality (before April 1917) that Wilson and other top officials increasingly discounted his views.

[1] Page was instrumental in negotiating the sale of American war materials, including munitions, food and supplies, to the British, helping to ensure that it had the resources it needed to continue the fight against Germany.

He worked on several newspapers, including the New York World and Evening Post, served as the editor of the Atlantic Monthly for a year between 1895 and 1896, and he also played a major role in establishing Doubleday, Page & Company, a prominent publishing house that produced the works of numerous well-known authors such as Rudyard Kipling and Henry James.

After a short time at the Gazette, in 1881 Page resigned to travel through the South, having arranged to contribute letters on southern sociological conditions to the New York World, the Springfield Republican of Massachusetts, and the Boston Post.

In 1882, he joined the editorial staff of the New York World; among his major work was a series of articles on Mormonism, the result of personal investigation in Utah.

The company sometimes published under the name "Country Life Press" in Garden City, New York, where Page resided in the years prior to World War I.

[4] In August 1915, Page's daughter, Katharine, wed Boston-based architect Charles Greely Loring in a ceremony at St James's Palace in London.

As ambassador, he defended British policies to Wilson and helped to shape a pro-Allied slant in the President and in the United States as a whole.

During an era in which a significant portion of the American public had come to regard the United States' entry into the European conflict as a grave mistake, Page's pro-British inclinations, and his supposedly high degree of influence over President Wilson's thinking, exposed the ambassador to charges that he had manipulated the president into intervening on behalf of the British in 1917.

Subsequent historical research has shown that Page had far less influence over Wilson's thinking than was previously suggested and he is no longer believed to have played a central role in the president's decision to go to war.