The Rise and Fall (and rise and fall and rise again) of Disney
In order to understand how the Disney films have changed, first one must understand why they have changed and the best way to do that is to comprehend the history of the Disney Animated Canon. This summary is hardly sufficient to cover the long and complex history of the Disney Company, but there is only a finite number of hours in a day so it'll have to suffice. Let us begin.

Everyone's favorite uncle. No, he did not cryogenically preserve himself under Disneyland, but he was an actual anti-semite.
In the beginning...
The Walt Disney Animation Studios was founded in 1923 as the Disney Brothers Cartoon Studios by Walt Disney and Roy O. Disney. Orginally, the studio produced animated short cartoons as most other animation companies were doing at the time, with the most well-known ones being the Silly Symphony series.

Not to be confused with Warner Bros' Loony Tunes and Merry Melodies, or MGM's Happy Harmonies, which were all released later (apparently there was some sort of trend they were following)
However, Walt Disney observed that the success of a cartoon usually depended less on gags and more on gripping stories with characters the audience will care about. So he started production plans on an animated adaptation of Snow White, which was be the first the first feature-length animated film in the English-speaking world and the first feature film made completely with hand-drawn animation. Called derisively as "Disney's Folly" by the film industry during its production, Snow White was released in 1937 to massive commercial and critical acclaim.

The classic story of a 13-year-old girl becoming a mother to 7 grown men and a wife to a guy she just met. No, really.
Snow White was released during the Great Depression, a time when the successes of First-Wave feminism and the liberated women of the Roaring Twenties were largely forgotten, primarily since people were too busy trying not to starve to death to care about women's rights. The competition for labor combined with Catholic moral reform movements fostered a national desire for women to return to the home. Snow White hence represents what the view of women's roles were at that time, the role of the housekeeper, keeping the family organized and fed while the men went to put food on the table.
Following the success of Snow White, the studio continued producing feature-length films in addition to the cartoon shorts. All of the films were critical hits but they were only modest box office successes.
1940

1940

1941

1942

OG Disney
However, after the release of Bambi, the production of feature length cartoons was halted as the studio's financiers at the Bank of America would only loan the studio working capital if it temporarily restricted itself to shorts production. This decision was partly due to the financial failure of the recent features and also due to Disney being cut off from the very lucrative overseas market because of some major event happening at the time.

Oh yeah. This guy happened.
During WWII
Since feature-length cartoon could not be produced during WWII, several ongoing projects such as Peter Pan and Alice in Wonderland had to be put on hold. No feature-length cartoons were produced, however several shorts were released in cinematic form as "package films", which were low-budgeted films composed of animated short subjects with animated or live-action bridging material. They received mixed to positive reviews and managed to keep the feature film division alive.
1943
1945
1946
1947
1948
1949






This is the cinematic equivalent of having no money to buy dinner so you toss everything in the fridge into a pot and hope for the best. (Although admittedly, it isn't that bad)
On a side note, during this time the Disney Studios also released war propaganda cartoons in order to increase profits as war propaganda was (obviously) very profitable at the time. One cartoon short is titled Der Fuehrer's Face and it involves Nazi Donald Duck going to work in a factory and then ending up in a pink elephants number a la Dumbo featuring living bombshells.
