Global beverages firm Foster's Group Ltd says consumers known as "millennials" will drive growth in the premium wine sector in the key United States market as they drink new products such as "Sledgehammer". The United States is Foster's biggest wine market, accounting for 50 per cent of wine revenue. Foster's wine arm, Treasury Wine Estates (TWE), is seeking to be the fastest-growing premium wine company by value in the US by fiscal 2013.