Spaghetti with Italian Sausage Ragout

Name: Spaghetti with Italian Sausage Ragout
Ingredients: 1 tablespoon extra-virgin olive oil; ½ pound italian sausage, casings removed, crumbled; 3 garlic cloves, minced; 1 medium red bell pepper, seeds and membranes removed, cut in ¼ inch dice; 2 teaspoons dried oregano; ½ teaspoon red chili flakes; ½ cup dry white wine; 1 28-ounce can italian plum tomatoes with juice; ¼ cup tomato paste; 1 bay leaf; 2 teaspoons salt; 1 teaspoon freshly ground black pepper; 1 tablespoon granulated sugar, optional; 1 pound spaghetti; Grated parmigiano cheese; Chopped italian flat leaf parsley