What type of housing was typically used by Northwest settlements?

The housing typically used by Northwest settlements was longhouses or plank houses, which were well-suited to the temperate climate and the available resources of the Pacific Northwest. These structures were often built from the abundant timber available in the region, particularly cedar. The design of longhouses allowed for multiple families to live together, reflecting the social structure of some Northwest Coast tribes, which often emphasized communal living and shared resources.

The use of plank houses also demonstrated the skills and engineering capabilities of these Indigenous peoples, as they crafted durable and spacious homes that could serve their needs effectively. This choice highlights the adaptation of the Indigenous cultures to their environment and their ability to utilize natural resources for shelter, indicating a deep cultural connection to their surroundings.

Other types of housing listed in the options, such as tipis, adobe huts, and igloos, are associated with different regions and climates in North America and do not reflect the architectural practices of the Northwest settlements. This context helps underscore why longhouses or plank houses are the correct answer.