The best answer i see is C) The natural features in an area include mountains, deserts, and oceans because these were all aspects of keeping native people from wondering to far.
Horace Mann was an educational reformer who lived in the US in the 19th century. He was a first to advocate a system of a public schools and public education as he believed that everyone had a right to education and that it should be free, democratic and have a professionally trained educators who would provide a quality education.
The political support extended by US in supporting Chile and Angola were significant.
Explanation:
It was during the Chilean civil war, US backed Chile' president but the British were supporting the congressional forces in Chile. It was after the American independence, that America began to exert great influence on the domestic affairs of Chile and even in the military efforts of the war and thus causing pressure to the British forces to leave Chile. The influence of the United States of America in both the economic and the political arenas of Chile has gradually increased over two centuries and continues to be significant.
U.S. assistance through the International Military Education and Training program finances professional military education opportunities at United States military education institutions. US is justified in supporting Chile and Angola, as they are the small nations which claimed independence and America is said to issue seventy three percent of Military support to the world nations.