When Mayte Lara Ibarra, the valedictorian of her high school’s graduating class, revealed her plans to attend the University of Texas at Austin on a scholarship, she did what any graduate would do: She shared her excitement on social media.

Ms. Lara also declared, proudly, that she is undocumented.

“Valedictorian, 4.5GPA, full tuition paid for at UT, 13 cords/medals, nice legs, oh and I’m undocumented,” she wrote in a tweet posted last week, hours after she gave her valedictory speech to fellow graduates at David Crockett High School in Austin.

In an era where the presumptive Republican presidential nominee, Donald J. Trump, has vowed to build a wall to keep out undocumented immigrants and many Latinos are rushing to seek citizenship to vote against him, others are finding ways to raise their voices or step out of the shadows.

Ms. Lara, whose path to the United States was not immediately clear and who didn’t mention her undocumented status in her speech, chose instead to talk about AP tests, proms and pep rallies. But on the same day, a few hours north in McKinney, Tex., another valedictorian, Larissa Martinez, did.