1 head iceberg lettuce, torn into bite-sized pieces
½ pound salami, cut into strips
1 cup shredded mozzarella cheese
1 cup shredded Cheddar cheese
1 tomato, chopped
½ cup pitted black olives, halved
1 tablespoon chopped fresh chives
1 (8 ounce) can tomato sauce
½ cup vegetable oil
¼ cup white wine vinegar
1 teaspoon white sugar
1 teaspoon dried oregano
1 teaspoon salt
¼ teaspoon garlic powder
⅛ teaspoon ground black pepper