True and he was the last prophet from God and brought Quran.
It took more than 1,000,000 men to build the Great Wall of China. They took several years. Around 2,000 years to be exact.
People started moving towards the South in the second half of the 20th century mostly for economic reasons. Southern states had cheaper standards of living and you could find a home easier and a job. The expenses were not as high as they were in the northern countries, mostly those in the north eastern part of the US.