In particular, the S-shaped soft pretzel, often served with brown mustard, became iconic in Philadelphia and was established as a part of Philadelphia's cuisine for snacking at school, work, or home, and considered by most to be a quick meal. The average Philadelphian today consumes about twelve times as many pretzels as the national average.
Pennsylvania today is the center of American pretzel production for both the hard-crispy and the soft-bread types of pretzels. Southeastern Pennsylvania, with its large population of German background, is considered the birthplace of the American pretzel industry, and many pretzel bakers are still located in the area. Pennsylvania produces 80% of the nation's pretzels.
The annual United States pretzel industry is worth over $550 million. The average American consumes about 1.5 pounds (0.7 kg) of pretzels per year.
The privately run "Pretzel Museum" opened in Philadelphia in 1993. In 2003, Pennsylvania Governor Ed Rendell declared April 26 "National Pretzel Day" to acknowledge the importance of the pretzel to the state's history and economy. Philly Pretzel Factory stores offer a free pretzel to each customer on this day.
Resources
1, Pretzel, From Wikipedia
2. Soft Pretzels, Food Network