1st Amendment-Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.
Mickey Mouse's first cartoon was "Mickey Mouse In Plane Crazy"(**), released May 15, 1928. The silent black & white cartoon was considered a failure after audiences didn't respond positively to Mickey, Minnie & Pluto. Walt & his animators produced a second silent cartoon (also black & white) called "The Galloping Gaucho" but the cartoon was shelved. Mr. Disney then began on a third Mickey Mouse cartoon called "Steamboat Willie". Though it too was black & white like the other cartoons, this one was the first ever to have synchronized sound. This third Mickey Mouse cartoon (produced) was the second to be released. It was released on November 18, 1928 and was a hit. The following month "The Galloping Gaucho" was finally released.
So there you have it folks.
** - In the summer of 1930, Walt copyrighted sound versions of the first two Mickey Mouse cartoons he produced. When he did Walt changed the name of the first cartoon from "Mickey Mouse In Plane Crazy" to "Plane Crazy".