Since the passage of "No Child Left Behind" (NCLB) in 2001, public schools in the United States have witnessed an influx of reforms intended to elevate students' academic standing in a global economy. The unprecedented federal involvement in education resulting from the passage of NCLB has propelled a nationwide movement to standardize instruction, raise achievement levels, and hold schools accountable for improved student outcomes. The kindergarten classroom has not been immune to these efforts. This critical review of literature published within the years 2001-2016 synthesizes empirical and theoretical research centered on US kindergarten post-NCLB. Connecting NCLB's increased emphasis on standards and accountability to issues of kindergarten readiness, the role of academics, play, and developmental appropriateness in kindergarten, and changes in kindergarten literacy instruction, the author examines the complicated nature of teaching and learning in kindergarten in the wake of NCLB, with implications for research, policy, and practice.