Answer:
Culture
Step-by-step explanation:
"Culture" makes people living in a country unique from all the other people in the world. It is a set of shared beliefs and behaviors that a community of people hold dearly.
For example, a "handshake" is a culture in the USA when meeting people for the first time. However, this is not the case in Japan. Japanese people prefer to "bow" when greeting. This clearly shows the differences of countries' cultures.