Explanation: Of the groups listed, only The International Red Cross is an NGOs rely on donations from people and groups who support their international efforts. Actually, some government do donate money to NGOs. The Peace Corps is an instrument of the U.S. government. The World Health Organization is a part of the United Nations.
The primary geographical feature that served as a boundary to westward settlement in 1760 was the Appalachian Mountains, since these were very high and treacherous and gave people very little incentive to cross.
