By Daniel Trotta (Reuters) -Book bans accelerated across the United States during the 2021-2022 school year, largely because of advocacy groups that called on public schools to remove more than 1,600 titles, the writers’ group PEN America said on Monday. There were 2,532 separate book bans affecting 1,648 titles at 5,000 schools with 4 million students, according to the report. The research found 1,000 more book bans than were documented in the group’s initial April report. PEN America said the rapid rise came as a growing number of groups have targeted books largely dealing with race or LGBTQ…