That gives all the history you need to know about this game world to understand what's going on. It's a bit weird, because it goes in reverse order, starting with the most recent (the treaty of courescant) but as it works it's way backward you'll see it's because they wanted to give you the most important stuff in the first few entries.
2. The reason everything looks so similar to the original trilogy is just because they want it to feel
like the star wars rather than it's own unique thing. It's very intentional. It seems that technology in the Star Wars universe just hasn't advanced over the thousands of years. You make make up your reason for why it doesn't advance.