First Point: The Big Three all agreed to join the new United Nations Organisation, which would aim to
keep peace after the war.
this was significant for the future peace of Europe because "the big three" were a very significant power at the time, so if they were all trying to ensure that peace would maintain after the war chances are no one would wanna take up arms against them, and if they did they would probably lose.
Second Point: They agreed that as countries were liberated from occupation by the German army, they would
be allowed to hold free elections to choose the government they wanted.
this was significant for keeping the future peace of Europe because countries would not be wanting to fight again, or start a war. they would be allowed a chance to start over in whatever type of a government they wanted with whatever leaders. They were given a pretty good deal and there wasn't really any way they could have been upset with this point, no fights or protests would break out.
2. Read Sources 2 - 11 on pages 320 and 321. What is your overall impression of the Yalta Conference based on these sources?
My overall impression of the Yalta Conference was that it's guests had very ranging opinions. Some were clearly sided towards Stalin, while others were supportive of the three Great Powers. I noticed a common theme of the sources was that a bunch of people disliked Churchill greatly.