American public opinion on controversial topics in schools is diverse and often divided along political, social, and cultural lines. Here is an overview of some of the key issues that have sparked debate and controversy in schools in recent years:

1. Sex Education: The teaching of sex education in schools is a contentious issue, with some arguing that it promotes comprehensive sexual health education, while others believe it's inappropriate and should be left to parents.

2. Evolution: The teaching of evolution, particularly in the context of science education, has been a contentious issue, with some advocating for the inclusion of creationist or intelligent design theories.

3. LGBTQ+ Issues: Topics related to LGBTQ+ identities, rights, and history have been at the forefront of debates, with some advocating for inclusivity and acceptance, while others oppose these discussions in schools.

4. Race and History: Discussions about race, racism, and historical events, including slavery and the civil rights movement, can evoke intense debates, particularly regarding how these topics are presented and the perspectives that are emphasized.

5. Religion: The role of religion in schools, particularly the place of prayer and religious observances, has been a subject of debate, with some advocating for religious freedom and others for the separation of church and state.

6. Gender and Identity: Issues surrounding gender identity, transgender rights, and the use of gender-neutral language and bathroom facilities have sparked controversy and discussions about inclusivity and equality.

7. Climate Change: The teaching of climate change and environmental issues has faced opposition from those who doubt its scientific consensus or believe that it's overly politicized.

8. Book Bans: Controversies over book bans have emerged in recent years, with some arguing for the removal of certain books from school libraries due to concerns about content, language, or viewpoints.

9. School Funding and Resources: The allocation of funding for public education and the provision of resources for students from different backgrounds have been points of contention in debates about educational equity.

It's important to note that these are just a few examples, and the opinions and stances on these topics can vary widely within the American population.