What began last week when students at a New York Ivy League school refused to end their protest against Israel’s war with Hamas has turned into a much larger movement. Students across the nation set up encampments, occupied buildings and ignored demands to leave Tuesday. Protests against Israel’s war with Hamas had been bubbling for months but kicked into a higher gear after more than 100 pro-Palestinian demonstrators who had camped out on Columbia University’s upper Manhattan campus were arrested last week. Dozens more protesters have been arrested at other campuses since, and many now face charges of trespassing or disorderly conduct.