What could cause rear wheel to lean inwards at the bottom?

A rear wheel leaning inwards at the bottom, often referred to as negative camber, can be caused by several factors. It may result from worn suspension components, such as bushings or ball joints, which can alter the alignment of the wheels. Additionally, improper wheel alignment, particularly if the toe or camber angles are off, can contribute to this issue. Lastly, damage to the vehicle's frame or axle can also lead to misalignment of the rear wheels.