Final answer:
The three contentious issues are land claims, self-determination, and addressing historical injustices like residential schools, all stemming from the consequences of colonization and governmental policies.
Step-by-step explanation:
The three contentious issues facing Aboriginals today include land claims, self-determination, and coming to terms with past atrocities such as residential schools. These issues stem from a long history of colonization and dealing with the aftermath of cultural collapse, governmental control, and manipulation of Native histories and cultures. Land claims involve disputes over territorial control and adequate compensation for the use of Aboriginal lands by government or private interests, especially in contexts such as large agricultural or mining operations. Self-determination is a critical issue as Indigenous peoples fight for autonomy, recognition of their treaty rights, and federal status, often amid legal and bureaucratic challenges. Confronting past atrocities, including forced education in boarding schools, is another pressing issue that impacts the social and cultural reconstruction among Aboriginal communities.