This sequential bar chart visualizes California government expenditure from 2012 to 2019, with each bar colored along a green sequential scale to indicate relative spending levels. The chart uses d3.scaleBand for the x-axis, d3.scaleLinear for the y-axis, and d3.scaleSequential with an interpolateGreens interpolator for the color encoding. The SVG is rendered in React, with data loaded from a CSV via d3.csv, and a d3-legend color legend shows the expenditure scale.