In the Senate there were three groups: the small number of "irreconcilables" who opposed the ratification of the treaty in any form; a larger group who favored ratification without amendments, but who finally expressed their willingness to accept "interpretative reservations"; and a large group composed mainly of Republicans who favored the ratification of the treaty only on condition that there should be attached to it reservations safeguarding what they declared to be the fundamental rights and interests of the United States. This group differed among themselves as to the character of the reservations that were necessary, and some of them became known as "mild reservationists."
It is probable that at the outset only the small group of "irreconcilables" hoped or intended to bring about the defeat of the treaty, but as the debate proceeded and the opposition to the treaty received more and more popular support, the reservationists determined to defeat the treaty altogether rather than to accept any compromise. The Republican leaders were quick to realize that the tide of public opinion had turned and was now running strongly against the President. They determined, therefore, to ruin him at all hazards, and thus to bring about the election of a Republican president.
When President Wilson realized that the treaty was really in danger of defeat, he determined to go on an extended tour of the country for the purpose of explaining the treaty to the people and bringing pressure to bear on the Senate. Beginning at Columbus, Ohio, on September 4, he proceeded through the northern tier of states to the Pacific coast, then visited California and returned through Colorado. He addressed large audiences who received him with great enthusiasm. He was "trailed" by Senator Hiram Johnson, who was sent out by the opposition in the Senate to present the other side. Johnson also attracted large crowds. On the return trip, while delivering an address at Wichita, Kansas, September 26, the President showed signs of a nervous breakdown and returned immediately to Washington. He was able to walk from the train to his automobile, but a few days later he was partially paralyzed. The full extent and seriousness of his illness was carefully concealed from the public. He was confined to the White House for five months, and had to abandon all efforts in behalf of the treaty.
On September 10 the Committee on Foreign Relations reported the treaty to the Senate with a number of amendments and reservations. The Committee declared that the League was an alliance, and that it would "breed wars instead of securing peace." They also declared that the Covenant demanded "sacrifices of American independence and sovereignty which would in no way promote the world's peace," and that the amendments and reservations which they proposed were intended "to guard American rights and American sovereignty." The following day the minority members of the Committee submitted a report opposing both amendments and reservations. A few days later Senator McCumber presented a third report representing the views of the "mild reservationists." It objected to the phraseology of the Committee's reservations as unnecessarily severe and recommended substitute reservations. The treaty then became the regular order in the Senate and was read section by section and debated each day for over two months. The amendments of the text of the treaty were all rejected by substantial majorities for the reason that their adoption would have made it necessary to resubmit the treaty not only to the Allies but also to Germany. The majority of the senators were opposed to such a course. The Committee, therefore, decided to substitute reservations for amendments, and Senator Lodge finally submitted, on behalf of the Committee, fourteen reservations preceded by a preamble, which declared that the ratification of the treaty was not to take effect or bind the United States until these reservations had been accepted as a condition of ratification by at least three of the four principal Allied and associated powers, namely, Great Britain, France, Italy, and Japan.
The first reservation provided that in case of withdrawal from the League the United States should be the sole judge as to whether its international obligations under the Covenant had been fulfilled. This reservation was adopted by a vote of 50 to 35.
The second reservation declared that the United States assumed no obligation to preserve the territorial integrity or political independence of any other country or to interfere in controversies between nations under the provisions of Article X "or to employ the military or naval forces of the United States under any article of the treaty for any purpose, unless in any particular case the Congress, which, under the Constitution, has the sole power to declare war or authorize the employment of the military or naval forces of the United States, shall by act or joint resolution so provide." This reservation was adopted by a vote of 46 to 33.
Reservation Number 3, providing that no mandate under the treaty should be accepted by the United States except by action of Congress, was adopted by a vote of 52 to 31.
Number 4, excluding domestic questions from consideration by the Council or the Assembly of the League, was adopted by a vote of 59 to 26.
Number 5, declaring the Monroe Doctrine "to be wholly outside the jurisdiction of said League of Nations and entirely unaffected by any provision contained in said treaty of peace with Germany," and reserving to the United States the sole right to interpret the Monroe Doctrine, was adopted by a vote of 55 to 34.
Number 6, withholding the assent of the United States from the provisions of the treaty relating to Shantung and reserving full liberty of action with respect to any controversy which might arise under said articles between China and Japan, was adopted by a vote of 53 to 41.