Why is it that people from the United States use American as their demonym?

The chief warlike engines used in the Grecian ships, were the Embolon, the Catastromata, and the Delphin. […] The Embolon was a beak of wood fortified with brass, which projected from the lower part of the prow, so as to pierce the enemy's ships under water.

Serene, smiling, enigmatic, she faced him with no fear whatever showing in her dark eyes. The clear light of the bright autumn morning had no terrors for youth and health like hers.

“I don't have a vagina,” he explained, “I have a bonus hole. Other names that don't make me cringe are boy hole and front hole”.