Combine crushed tomatoes, tomato sauce, diced tomatoes, capers, minced garlic, sugar, parsley, garlic powder, salt, oregano, basil, black pepper, and crushed red pepper in a large saucepan. Cover and bring to a boil. Reduce heat and simmer, covered, 45 to 60 minutes.

Bring a large pot of salted water to a boil while sauce simmers. Cook spaghetti until tender yet firm to the bite. Drain well.

Toss spaghetti with sauce.