* History: Studying history, particularly architectural history, gives you a deep understanding of design evolution, different styles, and the cultural contexts influencing buildings. It helps you appreciate the long-term impact of design choices and informs your own creative process. Knowing the history of building techniques and materials is also invaluable. While your high school history class likely didn't focus on architecture specifically, the analytical and research skills you learned are transferable.
* Geography: Understanding geography is crucial for site analysis and understanding environmental factors that influence design. Things like climate, topography, and local resources are all key considerations in architectural planning. While you didn't take it in high school, this knowledge can be gained later.
* Arts: Artistic skills are fundamental to architecture. Drawing, sketching, painting, and even sculpture can significantly aid in visualization, communication of ideas, and design development. While a formal arts education isn't always mandatory, the creative thinking and visual literacy fostered by art classes are extremely beneficial.
In short: You can become a successful architect without having taken these subjects in high school. However, the skills and knowledge gained from them are highly valuable and can enhance your architectural education and career. The lack of these subjects in high school doesn't disqualify you; it just means you might need to acquire that knowledge through other avenues, such as electives in college or self-study. The more well-rounded your background is, the more successful you will likely be.