You will find the best answer in the games and in the books. [quote][b]Posted by:[/b] J To The Eroen So the Forerunners see the flood, they take DNA from every living creature and blow all planets up with the Halo rings. A long time later everything goes back to normal and somehow the flood survived?[/quote]Nothing is "normal" again. It is simply a new beginning. [quote][b]Posted by:[/b] J To The Eroen Then there is an army called UNSC and they decide to make a spartan army.[/quote]The idea was to create something along those lines. However the amount of Spartans produced was hardly enough to be called an army. The Spartan IIIs were massed produced but they were sent on suicidal missions. [quote][b]Posted by:[/b] J To The Eroen For some reason this project gets cancelled 2 or 3 times but at last they keep making spartans. They train them while they are still kids on the planet reach.[/quote]The Spartan I program, or Project ORION was cancelled because it wasn't really effective. Sargent Johnson is a Spartan I. The Spartan II program went ahead, and wasn't really cancelled per say. Class II was never fully formed because all the money went towards MJOLNIR armour maintenance and the genetic requirements for Spartan IIs was very strict. The Spartan III program is the successor. It creates more Spartans than ever before but they are sent on tactical suicidal mission to buy Humanity time against the Covenant. [quote][b]Posted by:[/b] J To The Eroen Then Reach gets attacked by the covenant because the prophets said that the humans talk -blam!- about the fore runners or something?[/quote]The humans never talked -blam!- about Forerunners. They didn't even know what the Forerunners WERE. [quote][b]Posted by:[/b] J To The Eroen For some reason there are only 7 spartans left noble 1 to 6 and master chief. (what happened in the mean time?)[/quote]There are not seven Spartans left. Master Chief survived and so did some other Spartan IIs. Most of Noble Team died, Jun is the uncertainty. Some Spartan IIIs from Onyx survived as well. [quote][b]Posted by:[/b] J To The Eroen Reach falls and then halo combat evolved happens.[/quote]Correct. [quote][b]Posted by:[/b] J To The Eroen In the end they manage to destroy the flood cause for some reason the whole flood is on this one planet and they blow it up with the halo ring.[/quote] Basically. They were on Installation 04B. The Ark had created a new Halo to replace the one Master Chief blew up. Chief and Cortana travelled to the Ark and fired the single Halo ring. It killed all the Flood in the area (the ring, NOT a planet), but the Gravemind isn't truly dead. [quote][b]Posted by:[/b] J To The Eroen The prophets have been killed and the Covenant is not in war with the humans anymore (except for one small group that still believes in the prophets words and want to finish the task).[/quote]Correct. This group is called the Storm, which will appear in Halo 4. [quote][b]Posted by:[/b] J To The Eroen So yeah... I know theres alot missing but like i said, i dont need the full detailed version.[/quote]Not to sound like a dick, but a lot was incorrect about the original post. To answer your formal questions... [quote][b]Posted by:[/b] J To The Eroen 1. How did the flood survive the Forerunners' action with the Halo rings?[/quote]Some were kept on the rings themselves so the blast didn't affect them. [quote][b]Posted by:[/b] J To The Eroen 2. Why did the spartan creation got cancelled so many times?[/quote]Lack of funding/time, but it was never truly cancelled. [quote][b]Posted by:[/b] J To The Eroen 3. Why didn't they make like a billion spartan soldiers? (or at least 100 while halo 1,2 and 3 were happening?)[/quote]Lack of resources (money, time, etc). Besides it would be near impossible to train a billion. You can't just train anybody, you had to take people with certain genetics. These were the BEST humans on a genetic level. Spartan IVs are a whole different story though. [quote][b]Posted by:[/b] J To The Eroen 4. Why did the covenant started the war with the humans again?[/quote]It's not the Covenant, it's the Storm. They are a splinter group, but not every member of the former Covenant species wants to war again. The Arbiter doesn't want to start a war for example. [quote][b]Posted by:[/b] J To The Eroen 5. Why was the whole flood on that planet in the final mission of halo 3?[/quote]Because the Gravemind wanted to prevent the firing of the rings from the Ark. I'm not even sure if every single Flood form was there. I think there are still some Flood forms on Installation 05 (Delta Halo from Halo 2).