Which of these is considered the spark that began world war 1

a more perfect union: the creation of the u.s. constitution. the vote was unanimous. saddled with this weak government, the states were on the brink of not to lend a hand to any proceeding that seemed to pose a threat to that protection. delegates from virginia and other large states demanded that voting in

it would be  

germany had to pay all damages related to the war.

and i think

germany had to take sole responsibility for the war.