TAIPEI, Taiwan — The day after Li Chen-hsiu was sworn in as a member of Taiwan’s Legislature, she was questioned about whether she belonged — about her nationality, about her identity and ultimately about her loyalty to Taiwan. That's because Li is a “mainland spouse” — born in China and a citizen of Taiwan through marriage. She's part of a community of some 369,000 people in the island nation who are subject to rapidly changing policies — and some say discrimination — as tensions rise with China and Taiwan's government questions the spouses' allegiances. For the two months she served before being forced out of the legislature, Li was the country's only China-born lawmaker who had immigrated to Taiwan by marriage. “It's only because of Taiwan which has this free and democratic system, and the Taiwan People's Party which was willing to give a political newcomer a chance, that I could have this opportunity,” she told The Associated Press in July. But now, fears of a military invasion by China have complicated Taiwan's policy toward spouses like Li. She is part of a div