The first shots of the Civil War were fired at Fort Sumter in Charleston Harbor, South Carolina.
The answer depends on whose side you were on. The crusades were a time of much death, hardships and poverty on all sides as in all wars.
In Europe, most of the important people across the lands joined the crusades and travelled to the middle east to fight and "reclaim the holy land". Due to this large exodus, much of the wealth went with it, never to return and Europe became more lawless and poverty-stricken as a result.
Positive:
The founding of North America
Acquiring of wealth and natural resources
Negative:
The colonialism of Spain and Britain (From native's pov)
Slavery of natives
Led to the Atlantic Slave Trade
Arguably led to the Scramble for Africa
