by Leila MACOR MIAMI, United States (AFP) — The Dallas ambush by a black gunman targeting white police is the latest spasm of fury that reflects what experts see as a rising tide of extremism and intolerance on the fringes of American society. Fueling the country’s polarization are racial tension, anger with establishment politicians and economic inequality, says the Southern Poverty Law Center, which monitors racist and hate groups in the United States. Micah Johnson, […]