BEIJING (AP) — China is warning it will respond forcefully if U.S. House Speaker Nancy Pelosi proceeds with a visit to Taiwan, the self-governing island democracy it claims as its own territory.

Pelosi is second in line to the presidency and would be the highest ranking U.S. politician to visit Taiwan since 1997. China has threatened unspecified "resolute and strong measures" if she goes ahead, which analysts say could cause tensions to spike in the Taiwan Strait, considered a major potential Asian powder keg.

Here's a look at what's happening.

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WHY DOES PELOSI WANT TO VISIT TAIWAN?

Pelosi...