"C. was overthrown by invading Mongol tribes in A.D. 1279" would be the best phrase describing China's Song Dynasty, but this was of course not always the case.
Lever<span>, simple machine consisting of a rigid bar that rotates about a fixed point, called a fulcrum. </span>Levers<span> affect the effort, or force, needed to </span>do<span> a certain amount of work, and are used to lift heavy objects.</span>
Answer:
In 1776, it took the momentous step of declaring America's independence from Britain. Five years later, the Congress ratified the first national constitution, the Articles of Confederation, under which the country would be governed until 1789, when it was replaced by the current U.S. Constitution
Answer: The first wave had its worst year in 1942, where there were only a few states which remained democratic:
Finland
Iceland
Ireland
Sweden
Switzerland
United Kingdom
Australia
Canada
New Zealand
United States
Chile
