CAPE TOWN, South Africa (AP) — The U.S.-based organizers of an international human rights conference said they canceled it days before it was due to open because China pressured the African host country to exclude Taiwanese activists. Organizers Access Now, a New York-based advocacy group, said late Friday it had canceled the RightsCon summit in Zambia that was due to take place next week after the Zambian government initially said it was postponed. Access Now said it had been informed by