As villages grew bigger there were more people to work on the land. They had new skills and new technologies. The now had a surplus, which means you have more food than you need.
All their recourses had been taken from others. The east and west of the fertile crescent was able to expand. Wherever they went, they transformed human societies. Europeans went and took civilization to america. The man was criticized for being too simple. He thinks people are fundamentally similar. There are huge culture differences but that's not the rout cause. Untimatly the most important is raw materials. Even though they're trying to be more civilized and have more technology, they have a big gap to  overcome. It's not the lag of ingenuity, the whole issue was geography.

Labor force:
3.809 million (2010 est.) country comparison to the world: 91
Labor force - by occupation:
agriculture: 85% industry: NA% services: NA% (2005 est.)
Unemployment rate:
1.8% (2004) country comparison to the world: 11

Life expectancy at birth:
total population: 65.99 years country comparison to the world: 162 male: 63.78 years female: 68.31 years (2010 est.)
Total fertility rate:
3.54 children born/woman (2010 est.) country comparison to the world: 47
HIV/AIDS - adult prevalence rate:
1.5% (2007 est.) country comparison to the world: 43
HIV/AIDS - people living with HIV/AIDS:
54,000 (2007 est.) country comparison to the world: 63
HIV/AIDS - deaths:
fewer than 1,000 (2007 est.) country comparison to the world: 75
Major infectious diseases:
degree of risk: very high food or waterborne diseases: bacterial diarrhea, hepatitis A, and typhoid fever vectorborne diseases: dengue fever and malaria (2009)

Population:
6,064,515 (July 2010 est.) country comparison to the world: 105
Age structure:
0-14 years: 37.3% (male 1,126,214/female 1,088,211) 15-64 years: 59.3% (male 1,815,731/female 1,704,430) 65 years and over: 3.5% (male 113,285/female 92,904) (2010 est.)
Median age:
total: 21.6 years male: 21.9 years female: 21.3 years (2010 est.)
Population growth rate:
2.033% (2010 est.) country comparison to the world: 51
Birth rate:
26.95 births/1,000 population (2010 est.) country comparison to the world: 53
Death rate:
6.62 deaths/1,000 population (July 2010 est.) country comparison to the world: 148
Net migration rate:
0 migrant(s)/1,000 population country comparison to the world: 112