He told me the whole story of the incident.

Changes in the social system inevitably occur with time.

Slavery is something that robs human dignity and is absolutely unacceptable.

Feudalism characterized the social system of medieval Europe.

The North American beaver is a large rodent native to North America.

The wood duck is a very beautiful bird.

The American bison is a large mammal native to North America.

An American alligator can move very quietly underwater.

The American bison is known for its size and strength.

The American crocodile inhabits southern Florida and the Caribbean.