Considered revolutionary when Henry Gantt first published this planning tool around 1910, a Gantt chart is a type of bar chart that illustrates a project schedule. It illustrates the start and finish dates of the various activities of a project.

A Gantt chart is a type of bar chart

that illustrates a project schedule.

Explanation:

Named after its inventor, Henry Gantt (1861–1919), who designed such a chart around the years 1910–1915. Modern Gantt charts also show the dependency relationships between activities and current schedule status.

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers

sitting in that one chair where he could get shot at was his worst decision.