Final answer:
The source from the American Revolutionary War that supports the differences between the ideas and reality of the founding of the United States is a letter from a Revolutionary War soldier expressing disillusionment.
Step-by-step explanation:
The source from the American Revolutionary War that supports the differences between the ideas and reality of the founding of the United States is a) Letter from a Revolutionary War soldier expressing disillusionment. This letter would provide firsthand accounts of the reality of the founding and how it did not live up to the envisioned ideals. It would also highlight the lack of inclusiveness for all groups of people at that time.
A letter from a Revolutionary War soldier expressing disillusionment would likely provide a firsthand account of the realities faced during that time, highlighting the disconnection between the ideals and the actual experiences of individuals. It would offer insights into the challenges, exclusions, and imperfections that may not have aligned with the envisioned inclusiveness and perfection of the founding.