Budweiser came from a recipe and named after a Czech town called "Budweis". When deciding to come up with something uniquely original in the United States, they settled on this recipe after considering 100's of others. They were the very first to come up with a beer like this and 100's of other American companies tried following their lead after they became so successful. They were the first to introduce pasteurization to their beer, also, allowing them to also be the first to be able to transport their beer over great distances without it being ruined. They were also the first to introduce the "refrigerated train cart", which also assisted them into being able to transport their beer great distances.
A great American story.
...and when John Travolta was downing Budweiser at Mickey D's, there was not other beer to order at that time in the country. They had half the beer market in the United States for many, many decades.