What did the native american groups do to fight more effectively in the northwest (early us)

The Native American groups became allies with Britain and Spain.

Explanation:

The Britain and Spain made a friendly deal with native American groups to fight more effectively in the Northwest.

A state or country makes a friendly deal with another state or country to get military and other supports is known as allies. During World War II, the chief allied powers of America were Great Britain and France. To succeed in the war, America became allies with these countries.

The Delawares and Shawnees are the Native American tribes who became France's most important allies.