The conclusion is that although a US president can technically send troops into a foreign country, in order to lawfully declare war, he or she must get the approval of Congress.
The Greeks developed direct democracy and allowed citizens to choose their leaders and participate in decision making.
Because in the south there was more segregation. Also there was more land that had been untouched in the north. The property was also cheaper because of that reason. And since it was untouched a lot of businesses came in to drill for oil and other natural resources, which created the need for workers.
Tang Dynasty was able to strengthen China thru the efforts of its Tang Taizong and Empress Wu in which the former brought back China's government and the latter empowered women. The Song dynasty continued the good governance and elevated the military system thru systematized testing.
