Both exogamy and endogamy were common in the past. For instance race-based differentiation in marriages were enacted as laws and they originated in the American colonies within the seventeenth century.in many cases laws outlawed, criminalized and even banned marriages between whites and "negroes" or "mulattoes." These bans went on even after United Sates was founded. This is an example of endogamy whereby people were only allowed to get married to individuals from their group in this case their race. Whites were only allowed to get married to whites and "Negroes" were only allowed to marry their fellow "negroes." In the past people were also expected to get married outside their age groups. This means that people with the same age were not expected to marry each other.in many cases a husband was supposed to be older or from a different age group from the wife. This is an example of exogamy that took place in the past. Today there exist some form of exogamy and endogamy when it comes to marriages. There were amendments made in various laws which now allow people marrying other people who are not of their race. Today there are many interracial marriages and it is no longer illegal for a black to marry a white or an Indian to get married to a black. There are many intermarriages that are taking place .this has led to the creation of new races that are in between the two races. This is an example of exogamy that is common and prevalent in many societies in the world. There is also an increase in same sex marriages (Stone, 2004). There are many marriages today that are occurring between a man and a man or a woman and a woman. People are increasingly adopting the marriage between people of the same group when it comes to the sexual orientation. This is an example of endogamy that has become common today and many people are advocating for.

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Exogamy in instances where people are allowed to marry from different ethnic groups has led to a decrease in the number of cases where people marry their own blood relations. This is because one can not get married to someone they are related with if the person they are getting married is from a different race. On the other hand endogamy led to retaining of the cultural beliefs within a particular ethnic group. This is because there was no exchange of culture and hence the beliefs and norms remained intact after marriage.
It was believed that through exogamy there would be cultural exchange between two different ethnic groups. A common belief in endogamy was that the culture and tradition of the ethnic group would be retained and it would be passed on from one generation to another since people were getting married within the same group.