At first, the Portugal were not interested in colonizing the world. The other European countries like Britain, French, Germany, etc. started exploring other lands in search of food and doing trade business. They occupied parts of Asia and also America with the intention of doing trade and later on started controlling and declared wars on the native places of the people.
Finally they colonized various parts of the world and stared exploiting the resources in their interest. Thus at first Portugal did not had any intention to capture any land but they did so to prevent other European countries to declare and claim their territories in which they are doing business.
Archaeology is the study of the human past using material remains. These remains can be any objects that people created, modified, or used. Archaeologists use artifacts and features to learn how people lived in specific times and places.