Why didn’t the ussr join the allies until 1941

In his speech how does kennedy build his claim that the united states will defend freedom in its hour of maximum emergency? a.by arguing that the u.s. must enforce international law across the world since the united states is the lone superpower in the worldb.by demonstrating that the poverty which many people suffer from is an obstacle to true freedom  c.by stating that the u.s. will play an active role in fighting groups that are opposed to freedom, and by supporting groups that are fighting for freedom  d.by demanding that the adversaries of the united states be more willing to negotiate, or else there will be war

Following archduke franz ferdinand's assassination, austro-hungarian leaders: a. aided the ottoman empire in its campaign to keep serbia under its control. b. executed nearly all prominent serbs living in austria-hungary c. threatened to invade serbia if serb leaders did not agree to a set of strict demands. d.. formed an alliance with great britain to protect austria-hungary from future attacks.

How and why did the policies of the federal and state governments toward native american people change between 1790 and the 1850s. what were the reaction of native american people to these policies?