Answer:
The Chinese Invasion, and response against the UN's Invasion of Korea.
Explanation:
During WW2 the Soviet Union, and United States Of America did joint invasion of Korea, and after Japan had surrendered, The Small land mass was divided in two parts, the North getting occupied by the Soviets, and the South getting occupied by the Americans. Soon after letting Korea go as a puppet two powerful men, Syngman Rhee and Kim Il Sung had tried to conquer the other. North Korea started off with a lot of benefits from the Soviets, such as weapons and military advisors. Meanwhile due to Rhee's claims to start a first strike on the north, the USA refused to give weapons to South Korea, meanwhile North Korea decided to invade and conquer the south, due to lack of troops and weapons the north soon surrounded the South at Pusan. After the UN sent their troops into the South the North was slowly getting pushed back. Eventually they had launched a surprise invasion at Inchon, and had set up two beach heads, Blue Beach, and Red Beach. Eventually they managed to link the two beach heads up and take Inchon, the news hadn't reached the North for weeks, and when it did, they did a quick retreat to Seoul. Eventually the UN kept on pushing North Korea back and back until they had reach close enough to the Chinese Border. In response China invaded the North for themselves, the numerical advantage had helped them encircle many division, and barely letting them get away. This was catastrophic and the USA had commanded to retreat to the 38th parallel. The UN had barely stopped the Chinese from getting past the 38th, and finally the 1953 Korean armistice was signed, and had formally stopped the attacks from both sides.
North . The northern soil and climate favored smaller farmsteads rather than large plantations. Industry flourished, fueled by more abundant natural resources than in the South, and many large cities were established (New York was the largest city with more than 800,000 inhabitants). By 1860, one quarter of all Northerners lived in urban areas. Between 1800 and 1860, the percentage of laborers working in agricultural pursuits dropped drastically from 70% to only 40%. Slavery had died out, replaced in the cities and factories by immigrant labor from Europe. In fact an overwhelming majority of immigrants, seven out of every eight, settled in the North rather than the South. Transportation was easier in the North, which boasted more than two-thirds of the railroad tracks in the country and the economy was on an upswing. South . The fertile soil and warm climate of the South made it ideal for large-scale farms and crops like tobacco and cotton. Because agriculture was so profitable few Southerners saw a need for industrial development. Eighty percent of the labor force worked on the farm. Although two-thirds of Southerners owned no slaves at all, by 1860 the South's "peculiar institution" was inextricably tied to the region's economy and culture. In fact, there were almost as many blacks - but slaves and free - in the South as there were whites (4 million blacks and 5.5 million whites). There were no large cities aside from New Orleans, and most of the ones that did exist were located on rivers and coasts as shipping ports to send agricultural produce to European or Northern destinations.
Only one-tenth of Southerners lived in urban areas and transportation between cities was difficult, except by water. Only 35% of the nation's train tracks were located in the South. Also, in 1860, the South's agricultural economy was beginning to stall while the Northern manufacturers were experiencing a boom. The economic differences between the North and South contributed to the rise of regional populations with contrasting values and visions for the future.
