Answer:
The USA was afraid that communism would spread to South Vietnam and then the rest of Asia. It decided to send money, supplies and military advisers to help the South Vietnamese Government.
Explanation:
One of Korea's original three kingdoms, the Goguryeo, was itself heavily influenced by China. And another, the Silla, openly allied with the Tang against its foes. Korea also adopted new philosophies via China: first, Buddhism and later, Confucianism.
The correct answer is the Adams-Onis Treaty.
This 1819 land agreement between the United States and Spain. This land treaty helped to establish a clear between Spanish and US territories. In this treaty, the US gained the rest of modern day Florida while the Spanish border would now definitively start at the Sabine River.