A. when did activities occur that demonstrate americans' belief in manifest destiny?

In the 19th century the Manifest Destiny was a wide spread belief in America. Most activities that demonstrated the belief were; The Louisiana Purchase, The Alamo, Indian Reservations (Trail of Tears) and so on. The Manifest Destiny was a belief that often caused many problem among allies and enemies.

To be honest i thinks its between the first answer and the third answer