From the one-China policy to the Taiwan Relations Act, here’s what to know

People walk past a billboard welcoming U.S. House Speaker Nancy Pelosi in Taipei, Taiwan, on Aug. 3. (Chiang Ying-Ying/AP)

House Speaker Nancy Pelosi’s visit to Taiwan this week heightened tensions between China and the United States. Behind the recent developments, including Beijing’s show of force in response, is a long history of shifting ties and frictions.

Here’s what to know about the United States’ policies, communiques and assurances regarding China and Taiwan.

Pelosi vows China will not isolate Taiwan as military tensions soar