Yang came back for her third presidential election "because the DPP has already won [the last two presidential elections]. But this time Taiwan could become part of China. I'm afraid of this and I've come back to vote."
Jenny Chang, from the U.S.-Taiwan Ma Ying-jeou Support Organization in Los Angeles, was equally passionate about her candidate.
"Ma Ying-jeou can save the country," she said.
Many young voters also felt compelled by election issues to return to Taiwan to cast their vote.
Lily Wang, a 26-year-old doctor from Sydney, Australia, who left Taiwan when she was 12, returned to vote for the first time.
An enthusiastic Hsieh supporter, Wang said she came back to her birthplace "because it very important that everyone knows about Taiwan."
As a health-care professional, Wang also supported the referendums for Taiwan to join the United Nations and World Health Organization. Both of those measures failed, however.
Steven Lin, 27, left Taiwan when he was 16 and always wanted to vote in Taiwan. Now an undergraduate student at California State Polytechnic University at Pomona, Lin flew in to support Ma.
"Taiwan needs change," Lin said. "The past eight years, Taiwan has gone down economically; GDP has fallen. It is important that we pick the right person. We need a true leader to save Taiwan."
As a citizen of the United States and Taiwan, Lin is eligible to vote in both countries' presidential elections. He has not yet decided whom he will support in the U.S. election, but he said he appreciates the democratic process.
"I love America and I love Taiwan as well," Lin said.