By Ali Lyon Ladbrokes owner Entain’s aggressive marketing push in the US helped the gambling firm’s American division to bring in over a billion dollars (£780m) of revenue in the first half of the year. Bet MGM, which is a joint endeavour between the FTSE 100 Entain and MGM Resorts International, saw its takings rise by six per cent year on year thanks to expansions into North Carolina which now mean it has licences that allow it to access over half of the North American population. Its heavy investment into the region has, the firm claims, allowed it to capture roughly 22 per cent of the onli…