During times of war, some businesses may wither, others may flourish. The market for weapons, perhaps, would have a booming sales performance. This would attract people to come and work for them instead because they would need labor force. However, after the war has died down, people will stop buying these goods. It's time for them to rebuild their businesses. They would have to cut off expenditures to allocate for rebuilding. The easiest pool of expenditures for company owners are the wages. So, as a result, they would lay off workers. In the worst case scenario, businesses would have no way of paying the workers because they would go bankrupt.
Therefore, the answer is: Too many businesses went bankrupt following the war..
