They weren't so successful at conquering Europe or China. Of course, one can blame the long supply lines, but in these cases their adversaries were also determined to repulse them.
In contrast, Byzantium and Persia were exhausted from mutual warfare. Tribes related by kinship to Muslim Arabs had served as mercenaries during this period, so there was a lot of tactical knowledge available.
The Byzantines retreated to the highlands of Anatolia upon losing their lower-lying provinces to the Muslims. I am not sure if they launched a determined counter-attack. The Persians did, but they could not fight coherently.
Answer:
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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.