PORTLAND, Ore. -- In a high school classroom, Xavier Chavez is trying to teach a group of restless teenagers about Manifest Destiny -- the 19th century belief that the United States was divinely fated to stretch from sea to shining sea.

But these students are children of immigrants, and they first have to learn English. They might soon have to learn it faster if Oregon voters approve a ballot measure in November to limit the amount of time students can spend in English-as-a-second-language classes.

The proposal, modeled after similar laws in California, Arizona and Massachusetts, is one of a handful of immigration-related ballot measures that will appear this fall on state and local ballots across the nation.

"We call it the battle of the states," said William Gheen, president of the North Carolina-based group Americans for Legal Immigration. "More people have tried to get something like this on the ballot this year than ever before."

A year ago, groups that wanted to crack down on illegal immigration had hoped to push the topic front-and-center in the presidential campaign.

But the once-explosive issue has simmered down nationally, particularly since both major presidential candidates have endorsed a "path to citizenship" for the country's estimated 12 million illegal immigrants.

Now the immigration battles in November will be fought on ballots in Oregon, Missouri and California.

There are 64,000 non-English speakers enrolled in Oregon's public schools, the vast majority of whom are Spanish speakers. The proposal would limit high school students to two years of ESL classes, even less for younger students.

Chavez and his fellow teachers acknowledge that most of their students pick up colloquial English within two years, giving them enough fluency to poke fun at a teammate or answer a text message.