Workers at Volkswagen’s Chattanooga plant in the US state of Tennessee have voted overwhelmingly to unionize at the third attempt, the company and the United Auto Workers (UAW) have announced. The ballot, which ended on Friday, saw 73% of the workers backing the move. The result has yet to be confirmed by the National Labor Relations Board, an agency of the United States federal government. The UAW, which is seeking to expand its presence in the US automotive sector, sees the outcome as a significant victory. Two attempts to unionize the plant over recent years failed. But the union has scored…