The U.S. will struggle to accelerate growth from the current pace unless its government invests in infrastructure, manages immigration policy and improves education, said Robert Kaplan, president of the Federal Reserve Bank of Dallas. "[At the] Fed, we're worried about GDP and employment," said Kaplan, speaking at a moderated forum with executives from Burlington Northern Santa Fe and Kimberly-Clark Corp. "People are rightly saying one-and-three-quarters-percent, 2-percent growth is very disappointinga we must be doing something wrong.