World population is expected to reach 8 billion people in 2023 according to the United Nations (in 2026 according to the U.S. Census Bureau).
Answer:
The Han Dynasty, which succeeded the Qin, encouraged greater freedom of speech, established The Four Books and Five Classics as required reading for administrative positions which led to a wider dissemination of Confucian thought which would seamlessly blend with Chinese culture after the Han declared it the state
The United States had to face several challenges in redefining the union after the war. Two main problems were: how to deal with the Southern states that were still angry for losing, and what they should do with the ex-slaves. It was difficult to get American together after many people died in the Civil war and big part of the South was destroyed by the battles.
Apart from that, they had other challenges such as: building a solid economy, creating a stable political system, preserving the national independence (reducing conflicts with other nations and the nation itself), fostering American shipping, consolidating public support, reducing debts, etc.
