WASHINGTON – US House Speaker Nancy Pelosi has a long history of riling Beijing over democracy and human rights, whether by unveiling a banner on Tiananmen Square or in regular meetings with Tibet’s exiled spiritual leader, the Dalai Lama. Pelosi, the country’s most powerful lawmaker, stoked fresh tensions in US-China relations Tuesday when she flew into Taiwan, the highest-ranked elected US official to visit the island in 25 years. But it was only the most recent act to nettle China by the powerful 82-year-old lawmaker, who is second in line to the US presidency. Pelosi has taken every opport…