American Teacher Act This bill establishes grants to increase the minimum salary of public elementary and secondary school teachers. It also authorizes a national campaign regarding the value of the teaching profession. First, the bill directs the Department of Education (ED) to award four-year grants to states and, through them, subgrants to local educational agencies to establish a minimum annual salary of $60,000 (to be adjusted annually for inflation) for these teachers. Second, the bill directs ED to award grants to eligible state educational agencies to provide cost-of-living adjustments to the annual base salary of teachers. Finally, the bill authorizes ED to carry out a national campaign to (1) increase awareness about the importance of teachers and the value of the teaching profession, (2) encourage secondary school and college students to consider teaching as a professional career, and (3) diversify the pool of individuals who enter the teaching profession.