There were many factors and attacks but in spite of all these confrontations, it was an attack that lit the flame that blew everything up and war was declared. It was the assassination of Archduke Franz Ferdinand, heir to the throne of the Austro-Hungarian Empire on 28 June 1914 in Sarajevo.
Confucianism or Buddhism. C or D. Your best bet is Buddhism if the question doesn't include to select more than 1 answer.
Before people relied on their own skills of hunting/gathering to survive, now people developed tools and methods to utilize nature into what they need ie farming, cross breeding, livestock before it was always moving to where animals were to hunt or plants now one could settle anywhere if they know methods to farm and breed
The Battles of Lexington and Concord were the first two battles between the British and the colonists.