OAK CREEK — Every year, roughly 5 million American flags are made in Oak Creek, at Eder Flag — the largest flag and flag pole manufacturer in the nation. As the country celebrates its 250th birthday, business is up more than 40% compared to the same time last year, and the people behind each stitch say the work means more than a paycheck. Missy Verdev, a fashion designer who immigrated from Uganda, is one of those workers.