Why do they say that the Trojan War was Aphrodite's Fault?

There was a beauty contest between Hera, Athena, and Aphrodite and Aphrodite won. She promised Paris, the prince of Troy, the most beautiful woman in the world, named Helen, to be his wife. There was one problem, Helen was married. The other goddesses were enraged by Paris' abduction of Helen and this caused the Trojan War.