Final answer:
The first NFL championship game at Wrigley Field was held in 1933. This game highlighted the growing popularity of professional football following the widespread enthusiasm for college football in the United States.
Step-by-step explanation:
The first NFL championship game held at Wrigley Field took place in the year 1933. Professional football had been gaining in popularity, following the trend of college football's rise in the late 19th and early 20th centuries. While college football sparked conversations every weekend and led to concerns about player safety due to the physical nature of the game, professional football continued to grow and implement innovations like the forward pass to make the game safer and more dynamic. The NFL championship game showcased the highest level of professional football, attracting fans to iconic venues like Wrigley Field.