In the summer of 1989, Tim Walz faced a difficult choice.
A newly minted college graduate from small-town Nebraska, he had just turned down a stable, 9-to-5 job offer and moved across the world to teach at a local high school in China.
He had made it as far as Hong Kong, just across the Chinese border, when People¡¯s Liberation Army tanks rolled into Tiananmen Square to crush pro-democracy protests.
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