What were the events that led to World War II?

Hitler invaded Poland.

Explanation:

On the 1st September 1939, Hitler invaded Poland from the west; two days later, Britain and France declared war on Germany, launching the Second World War. On 17 September, Soviet troops invaded Poland from the east.

the answer to number 5 is fort sumter

an economic reason that the south needed a reconstruction plan is that plantations, factories, and other businesses were destroyed during the war.