How does the US Department of Education affect what happens in your classroom?

Former public school teacher (16 years) here. When I was a teacher, I never really cared about our school board or state department of education because I couldn’t see what effect they ever had on what happens in my classroom. I had my textbook, I designed my lessons. Heck, even the administrators in my school barely had an effect on what happened in my classroom. So, opinions of Trump and his/Republicans’ motives aside, how does the Department of Education actually affect what happens in your classroom?

Edit: Thank you to everybody who explained how the DoEd primarily distributes funding to support poorer schools and students with disabilities. While much of my school was located in a wealthy area, we did have students from low income households. As a teacher I was never involved in funding programs in my school. If I had an IEP, I followed it because I cared about my students and respected the Spec Ed specialists in my school. While it admittedly shows a lack of civic responsibility, it shouldn’t be that surprising that I wouldn’t know how the DoEd was affecting my students, if not my lesson plans.