Question

When did activities occur that demonstrate Americans belief in Manifest Destiny ?

Answer 1

The 19th century in general, although you can say that the botched invasion of Canada during the war for independence was also an illustration of this idealism. 

Answer 2

1783, expansion of American territory via the Treaty of Paris; 1803, the Louisiana Purchase; 1845, Texas annexation; 1848 Mexican cession

Step-by-step explanation: