What organizes and unites groups of people? How does geography affect development?

There are many factors that unite groups of people. One of the most common factors is culture. More often than not, people from the same culture share core values that tend to unite them. In addition, religious beliefs are also unifying factors in groups of people.

Geography affects development in a variety of ways, on of them being how geographical factors, such as mountain ranges, can force civilizations to develop isolated from the countries around them and the rest of the world. Because of this, they are deprived from any outside influence as well as technologies.

the answers are 1 and 4