Without vaccination, it is likely that the USA would have lost the war and we might not be a country today.
According to Dr. Andrea Love of Immunologic.
(Graphic description of medical procedures from the 1700s follows)
Article excerpt:
Variolation provided immunity to smallpox.
In the 1700s, the method of providing immunity to smallpox was through variolation, considered the first vaccination. This was performed by doing an intentional inoculation with the Variola virus. There were different methods, but the original method involved taking smallpox scabs - filled with virus - drying them over a fire, grinding them up, and blowing it up peoples noses. The process of variolation evolved over time. By the mid-1700s variolation methods also included introducing smallpox pustule material into a cut on the arm or using contaminated cloths as bandages.
Variolation had some issues. Remember: this was not a vaccines of today: this was intentional inoculation with a potentially fatal virus.
Link to the full article https://open.substack.com/pub/immunologic/p/the-usa-exists-because-of-vaccines