Answer: The European-owned coffee and sugar plantations in Hawaii were a threat to the indigenous populations in several ways. The plantations forced the native Hawaiians off the land they had lived on for generations, leading to a loss of their traditional way of life and culture. The destruction of natural habitats that were home to native species of plants and animals was also a major concern for the indigenous people. The plantation system of growing crops for export was established by Anglo-American businessmen who shifted the native agricultural economy to this new system. This led to a decline in the native Hawaiian population due to diseases introduced by Western colonizers.
In summary, the European-owned coffee and sugar plantations in Hawaii were a threat to the indigenous populations as they forced them off their land, destroyed natural habitats, and led to a decline in their population.