Answer is: trade.
Portuguese expansion began in the fifteenth century. At the 19th century, Portugal controlled six locations in Africa. Portuguese hold in Africa was weak. They used <span>trans-Saharan </span>trade<span> routes between Songhay and the North </span><span>African for gold trading, also t</span>hey trade guns for slaves.
Pro so we can have order,so we can not go out of control and be able to negotiate with other countries about peace cons there will always be a higher power than citizens, there will not be much voice from citizens
Measured along with the Lualaba, the main tributary, the Congo River has a total length of 4,370 km (2,715 mi). It is the only river to cross the equator twice. The Congo Basin has a total area of about 4,000,000 km2 (1,500,000 sq mi), or 13% of the entire African landmass.