European, Asian and Canadian companies are taking advantage of the weaker dollar to buy their U.S. counterparts at a record pace, increasing investment in the United States but also raising fears about a potential loss of jobs and autonomy. "We could be looking at the world's largest tag sale if we continue to see declines in the dollar," said Donald Klepper-Smith, chief economist at DataCore Partners. In the latest large deal aided by a weak dollar, Commerce Bancorp, which is based in Cherry Hill, New Jersey, agreed Tuesday to be acquired by Toronto-Dominion Bank of Canada in a cash-and-shares deal...