What prompted russia to enter the war in 1914?

 When Austria's Archduke Franz Ferdinand was shot dead in Sarajevo in June 1914, it triggered a wave of threats, ultimatums and troop mobilisations. By August, Serbia had been invaded by Austria-Hungary and Russia had declared war in response, prompting the German Kaiser to declare war on his Russian cousin.

Explanation:

it is

a

asked for and recieved from the united states

b: to eliminate competition from other farmers