BEIJING — China blocked imports of citrus, fish and other foods from Taiwan in retaliation for a visit by a top American lawmaker, Nancy Pelosi, but has avoided disrupting one of the world's most important technology and manufacturing relationships.

The two sides, which split in 1949 after a civil war, have no official relations but multibillion-dollar business ties, especially in the flow of Taiwanese-made processor chips needed by Chinese factories that assemble the world's smartphones and other electronics.

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