Taiwan is preparing to elect a new president and legislature Saturday in what many see as a test of control with China, which claims the self-governing island republic as its own.

Taiwan is preparing to elect a president and legislature Saturday in what many see as a test of control with China, which claims the self-governing island republic as its own territory to be unified with force if necessary. The presidential race is tight, and both China and Taiwan’s key ally, the U.S., are weighing in on political and economic issues they hope will sway voters.

The election pits Vice President Lai Ching-te, representing the Democratic Progressive Party, against Hou Yu-ih of the main opposition Nationalist Party, and former mayor of the capital Taipei, Ko Wen-je of the Taiwan People’s Party.

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Along with the tensions with China, much in the Taiwan election hinges on domestic issues, particularly over an economy that was estimated to have only grown by 1.4% last year. That partly reflects inevitable cycles in demand for computer chips and other exports from the high-tech, heavily trade-dependent manufacturing base, and a slowing of the Chinese economy. But longer-term challenges such as housing affordability, a yawning gap between the rich and poor