How has China built relations with African and South American countries?

Modern Sino-African relations between China and the African continent began in the 1950's when China signed a trade agreement with Algeria, Egypt, Guinea, Morocco and Sudan. Over time, the trading between China and African countries flourished, and
in 1999, the total Sino-African trade volume was US$6.5 billion. However, by 2005, the total Sino-African trade had reached US$39.7 billion, and in 2006 it jumped to US$55 billion. Africa provides 1/3 of Chinese oil supplies, prompting a lot of Chinese investment in the energy sector in recent years.

http://en.wikipedia.org/wiki/Sino-African_relations

 Here is the geographical location of China and the continent of Africa.

Key points:

- Modern Sino-African relations began in 1950's.

- Relations have flourished due to trade.

- Africa provides 1/3 of Chinese oil supplies.

- This has prompted a lot of Chinese investment in the energy sector in recent years.