In the United States most archaeologists are trained in university programs of anthropology. Anthropology is the study of man in all times and in all places. Archeology is a sub-discipline that uses material remains to study people and cultures of the past. No and no. It is a common misconception that archaeologists are only interested in Indian history.
Archaeologists are interested in the human story through a study of the things they left behind.
In North America, that involves both the Indian and the Euro-American cultures. In other parts of the world, archaeologists study the history of the people who lived there. As for dinosaurs, those studies are left in the capable hands of the paleontologists. Paleontologists study the fossils of extinct animals, including dinosaurs. Taking artifacts without using proper scientific methods destroys irreplaceable evidence from the past.