Original sentence: The new force was initially to be called the North West Mounted Rifles, but this proposal was rejected as sounding too militaristic in nature, which Macdonald feared would antagonize both First Nations and Americans; however, the force was organized along the lines of a cavalry regiment in the British Army, and was to wear red uniforms
Edited sentence: The new force was initially to be called the North West Mounted Rifles, but this proposal was rejected as sounding too militaristic in nature, which Macdonald feared would antagonize both aboriginals and Americans; however, the force was organized along the lines of a cavalry regiment in the British Army, and was to wear red uniforms