NITED NATIONS, Nov. 19 - Faced with polarizing division in the 191-member General Assembly, the United States abandoned a bid today that it had aggressively pursued to obtain a United Nations treaty banning all human cloning, including that done in the name of medical research.

The outcome - an agreement to come up with a nonbinding declaration against human cloning - fell far short of the American goal and represented a setback for President Bush. He called for a worldwide ban on all cloning when he spoke at the opening of the United Nations General Assembly in August and made limiting stem cell and other research known as therapeutic cloning an issue in his presidential campaign.

All 191 United Nations members are agreed on the need for a treaty that would prohibit cloning human beings, but they have been stalled for three years by sharp differences over whether to broaden the ban, as the United States wishes, to cover therapeutic cloning.