It will be worth it, so that we can work on the wall.
Qin had a very big army, so he could atack all the 6 warring states. That was when the Han Kingdom had an earthquake. This gave Qin the amazing idea, he took the opportunity to see that they were already having a hard time after the earthquake, he could just go attack them. That was one of the warring states but for the next 4 years he destroyed the rest.
Lao wanted to rebel and take over qin shi. So he gathered up a anomass army while qin was traveling, Altho Laos plan did not work so the Qin had to do something to punish him. He tied loas arms and legs to a horse and had the horses start running in all different direction. This gave Loa a very hard and painful death.
At this time Qin Shi was facing a lot of threats from the north, so he had an idea. I thought that he could build a big big wall, the north wouldn't be able to attack. So he took all of the enslaved and criminal people to go a build it for him. Most people died while building it, and the qin empire didn't actually finish it. All in all this was how the great wall of china was started.