The British established an "opium" trade with China, since opium was in high demand in Asia, and both the British and the Chinese saw an opportunity to make immense profits.
Famine is yes a pull factor in cases of needing to go to war but what are you asking exactly?
Answer:
When war broke out in 1861, kids across the North and the South said goodbye to their fathers, brothers, uncles, and cousins — or joined the military themselves. ... As many as 20% of Civil War soldiers were younger than 18. That was ... a Confederate prison in which thousands of Union men died of starvation and disease. For many, the Civil War was about only one issue: slavery. For others, it was about preserving the Union. It must not be forgotten that there were slave-holding states in the Union. John Brown and other radical abolitionists wanted a war to free the slaves and instigate insurrection. Military can help fund service members' education. Military ... You absolutely do not want to have a job that gives you any kind of vacation time!
Allied leaders met at Yalta, Crimea to begin to prepare for the postwar period
