The Truman Doctrine was an American foreign policy created to counter Soviet geopolitical expansion during the Cold War. It was first announced to Congress by President Harry S. Truman on March 12, 1947. More generally, the Truman Doctrine implied American support for other
nations threatened by Soviet communism. The Truman Doctrine became the
foundation of American foreign policy, and led, in 1949, to the
formation of NATO, a military alliance that is still in effect.
I think T'ai-tsu is the person who made Changan his dynasty's capital
Answer:
A siege is a military's tactics that's carried out by surrounding the enemy's town with our own forces.
This tactic Brought Victory for American soldiers during our battle for Revolution against British army in Yorktown. In 1781, American colonists mobilized around 9,000 soldiers to surround Yorktown that occupied by the British soldiers.
This siege cut off every potential path that Yorktown soldiers usually used to receive their food supplies. In the end, the food supplies inside Yorktown started to gradually diminished and the leaders of Yorktown decided to surrender.
<span><span>Rene Descartes is known
for the Cartesian coordinate system and the belief that mathematics can explain
all of nature. He is the father of analytical geometry (by using algebra
to describe geometry). We often relate to his Cartesian coordinate system in
maps or graphs to know how far along and how far up it is. </span>He
was also the one who invented the representation of unknowns in
mathematical equations by using x, y, and z, and then the
knowns by using a, b, and c<span>.</span></span>
